* New "Event URL" segment `eventUrl` to segment on any Segment URL

Useful for many use cases for example:

* Creating Custom Reports such as "Top page URLs by Event action"
* Segmenting by Event URL and view events triggered on a specific Page URL
* Fixes #11131 Action URL segment could filter both Page URLs OR Event URLs (as advertised originally in the 2.16.0 changelog but it wasn't actually fully working yet)

* fix typo no capital letter

* remove column type to prevent new column being created in the log_link_visit_action table

* set correct action type for segment eventUrl

* modify test

* eventUrl needs action data

* fix suggested values for eventUrl

* update test files

* event url is stored without protocol

* update test file

* In log importer, allow filtering logs by host & datetime (new submodule commit + tests).

* Add tests for replay tracking filtering & check that filtered line is in output.

* More log filtering tests for log replay.

* Extract mail configuring parts of sendReport method & write tests for them.

* Use twig in AttachedFileReportEmailGenerator.

* Extract header/footer of html scheduled report email into re-usable View subclasses & use for PDF/CSV emails.

* Fixing test failures.

* Integrationt est

This reverts commit 23249e9e.

* Minor changes to wording

* Add a mention to the InvalideReports plugin

* use composer version of geoip library

* region london was renamend in latest geoip version

* http://piwik.org -> https://piwik.org

* more HTTPS URLs

* some more HTTPS URLs

* test README

* don't show "Plugin Hompage" for Piwik plugins

* fix tests

* compile minified js

(hope I didn't break anything)

* some more small changes

* fix UI test

* comment length in piwik.js changed due to https links

* fix test

* update ui file

* update submodule

* improve promo widget

* fix tests

* column tweak

* fix install

* more tweaks

* rename column to dimension

* various fixes

* added new control expandable select

* starting to refactor segment selector

* make segment editor work again

* use translation keys

* defined some metrics

* set types

* simplify

* simplify

* fix join generator

* add possibility to use custom join table names when using query builder and it uses an inner query

* fix bug in query selector when selecting same field name from different tables twice

* more metadata

* more tweaks

* improve selector

* add possibility to use custom entity names

* also processed archived metrics

* generate sql filter, suggested values callback, and accept values automatically for columns with enums

* several tweaks

* focus search field when opening it

* various tweaks

* added missing method

* format and fix more metadata

* more fixes

* better definition

* define custom filter

* fix definition

* fix various tests

* fix more tests

* fix bug in logquery builder

* fix referrerurl segment was missing

* fix some tests

* fix more tests

* add group

* refactor for better definition

* fix a bug in log query builder when similar columns are used in archiver

* add goal metrics

* various fixes

* make datatable row more flexible

* various fixes and visualization enhancements

* simply segment editor and make it smaller

* remove trailing comma

* various fixes and added new dimension

* fix formatting of returning customer

* added missing primary key

* fixes

* various fixes and improvements

* make sure to update segment definition when selecting a value from auto complete list

* various fixes and more metrics

* more metrics

* more dimensions and fixes

* fix some tests

* fix some integration tests

* update submodule

* fix some system tests

* fix ui tests

* trigger new test run

* fix more ui tests

* fix system tests

* update submodule

* fix categories

* sort segments by category for more consistency

* add custom variables

* some translations and fixes

* add minute segment

* more segments

* added plurals

* added some docs

* fix test

* fix tests

* fix tests

* added suggested values

* fix some tests

* various fixes

* fix more tests

* allow to select segments on any site

* make sure to include file

* added doc block

* fix some system tests

* fix most system tests

* fix ui test

* fix system test

* adjust examples

* added more tests and docs

* no metrics for these dimensions

* added developer changelog and made some classes public api

* some fixes for entity names

* add possibility to set format metrics in test

* more consistency in defining the name

* get idsites only if provided

* fix integration tests

* added another segment for visit start hour and visit start minute

* more clear name for segment

* use old segment name to not break bc

* various fixes

* more test fixes

* fix no suggested values for new segment

* add event value

* for boolean dimensions only sum metric

* update available widgets when updating reporting menu

* Add new segments in developer changelog + typo

* fix system tests

* fix screenshot test

* updates device detector to 3.8.2

* update test file

* submodule update

* updates screenshots

* update test files

* submodule update

* updates screenshot

* write current interaction position for all actions

* fix some tests

* fix more tests

* update tests

Reports did not show currently, because widget configs in containers with ByDimension layout have modified categories/subcategories.

They thus did not show up under the right category (the category of the widget container). Fixed by using the right category
in getWidgetMetadata (but not getPagesMetadata).

* Make visitor profile wellformed XML

* update test files

* makes profile query independent from events plugin

* move more stuff to event plugin

* update test files

* Revert "free tibet!"

This reverts commit 4e47c8ab.

* Remove unneeded translations

* adjust API

* fix tests

* update screenshots

* update tests files

* update screenshot

* Do not change detected location

* update tests

* Fix continent detection for old records

* submodule update

* update screenshots

* Cleanup

* use group by filters only if needed

* make filter work for datatable maps

* Allow different reports pre-archiving frequency for each period

* Add new config settings for archive frequency

* added default config for range dates

* print changed archive periods

* minor change to log output

* Clarify wording, processed != requested.

* Fix integration test

* move setting visitor details into own classes instead of using an event

* move manipulating actions to VisitorDetails classes

* move some more parts to plugins

* update test files as order of columns changed

* implement new VisitorDetails method to provide actions

* move rendering actions to visitordetail classes

* render visitor properties in new classes

* makes it possible to attach icons to visitor log

* moves rendering of action tooltip into new visitordetails method

* adds event for extending custom action dimension fields

* small improvements

* fetch log_link_visit_action.idpageview for actions

* improve variable name

* started to improve/change visitor profile

* show devices summary in visitor profile

* also remove empty xml tags for api tests

* hide actions in visitor profile by default

* move all icons to the middle of visitor log

* small change

* move rendering referrer information to referrers plugin

* move provider logic to provider plugin

* show content interactions in visitor log

* improve look of content interactions/impressions in visitor log / profile

* hide idpageview from tests

* update changelog

* move rendering events to Events plugin

* do not hide duplicate page views in visitor log, but show them with a refresh icon instead

* show top visited pages in visitor profile

* always show visitor profile link in visitor log

Still hidden in a widget by default, as it might overlay some other content

* Show info about not shown actions

truncated due to config setting

* use bulk queries to fetch actions instead of fetching them for each visit

* small adjustments

* improve some loops to improve memory usage

* move gathering visitor profile informations to VisitorDetails classes

* update screenshots

* update test files

* move rendering of visitor profile summary to visitor details classes

* improve templates

* Makes VisitorDetailsAbstract class api and improves comments

* show visit details in visitor profile

* improve css

* reverse enumeration of visits in visitor profile

* improve css

* Show visit id in IP tooltip

* Small CSS improvements

* further adjustments

* sort devices by count

* adds UI tests for visitor log and profile

* Show bandwidth in visitor profile test

* show actions by default and add button to toggle all together

* CSS cleanup

* remove border around refresh icon

* add tooltip for refresh icon in profile

* move first/last visit before top visited pages

* Improve text shown for unique pageviews

* link urls in top visited pages

* improve sorting of device list

* improve tests

* Improve device overview in visitor profile

* only render top pages if at least one page was visited more than once

* make visitor id non bold

* hide visitor type icon in profile, and show latest visits icons in overview

* fix search engine icon in visitor details

* small improvements

* only render view if required

* show visit icons only on hover in profile

* remove from again

* test improves

* show text besides icon in profile header

* improve tests

* Removes unused CSS and JS

* Reformats CSS

* Removes invisible paper clip

* Removes unused profile images from Live plugin

* raise test timeouts

* Improve UI tests splitting for travis

* show device type in profile header if no resolution is available

* prevent text overlapping

* no retries

* fix test

* change summary order

* fix position of export icon

* fixes tooltip text

* improve pages overview

* visitor details order

* action tooltip order

* show only ecommerce icon if no goals where converted

* show custom variables summary in profile

* show user id in same size as headline

* link referer urls for first/last visit in profile

* make profile xml compatible

* try to improve ui test

* increase bottom marign

* increase version number

* small adjustments

* CSS Rewrite for visitor profile

* center action icons in visitor log and profile

* improve widgetized visitor profile

* small layout fix

* always populate raw referrer url for visitor details

* update expected test files

* Refactor profile summaries into additional classes

* update screenshots

* submodule update

* update piwik-icons submodule (#11904)

* update piwik-icons submodule

* fix some system tests

* update screenshots

* make device list xml compatible

* improve translation

* improve icon position

* improves spacings

* update test files

* small css improvement

* update screenshots

* update device detector

* sort brands for segment

* submodule update

When tracker is in maintenande mode return HTTP status code 503 (instead of the current 200 and 400 http status cods) (#11773)

* When tracker is in maintenande mode, return HTTP status code 503 instead of the current status of 200 or 400

This will make our return code consistent with the UI which also returns 503 while in maintenance mode

 Learn more about starting a maintenance window: https://piwik.org/faq/how-to-update/faq_154/

* Update TrackerResponseTest.php

* Update TrackerResponseTest.php

* Use localized format to display hour in Visits per time reports

* updates cldr data

* update test files

* updates composer packages

* update tests

* Fixing travis-ci/local inconsistencies in AutoSuggestAPITest.php. (userAgent was not correctly set in fixture)

* In CliMulti, ignore zombie processes when parsing ps output.

* Set URL of tracker in ThreeVisitsWithCustomEvents fixture, so test does not depend on _SERVER["HTTP_HOST"] which in turn depends on dynamic INI config value.

* PHPUnit tests should not refer to each other, otherwise the PSR autoloader will be used, and PHPUnit will not load the file itself (resulting in the test not being run).

* Update OneVisitorTwoVisitsTest expected files.

* URL encode attribution date time in fixture since the tracker will not do it itself.

* "Send an email when a plugin update is available" is On by default since Piwik 3.0.0-b1

follows up https://github.com/piwik/piwik/pull/10691

* UI screenshot

* Improve handling of DevicePlugins to make it extendable

* update test files

* add some comments to explain automatic plugin column detection

* submodule update

* update icon submodule

* fix UI tests

* fix system tests

* fix another UI test

* Fix system test

* move old brand icons to piwik icons

* update submodule

* fix some tests

* update submodule

* fix another test

* Updates screenshots

* update UI test screenshots

* update system test files

* use new device icons

former plugins/DevicesDetection/images/screens

* replace normal.png with desktop.png in tests

* fix most tests

* submodule updates

* update screenshots

* update exptected test files

* updated flag icons

* remove lines completly

* Visitors in Real-time

* added ti flag

* fix merge

* readd logoHeight

* remove flags from plugins/UserCountry/images/

* change flag directory

* (hopefully) fix all tests

* UserCountry system tests

* Fix tests refs https://github.com/piwik/piwik/pull/11553

* Fixed CustomDimensions tests

* remove unused flags

* remove flag of united nations

* System tests with new path

* light border around flags in goals and live view

* Fix BC system test

* border around flag in visitor profile

* Border around country flags in reports

* border around flag icons in HTML reports

* simpler css

* System tests

* UI tests show new flags + borders around them

* use report property to enable/disable flattener

* update tests

* Update changelog [ci skip]

* minor renamings

* add icons submodule

* replace path

* change submodule url

* fix JSONTest

* fix integration tests

* update icon submodules

* fix preg_match

* fix remaining system tests

* better match for non dist icon files

* fix .gitmodules

* update icon submodule

* Fixed custom dimension test

* Do not completely fail when GD not enabled

* Fix http test + refactor checklist

* Refactored the code into a method

* Changed icon path refs https://github.com/piwik/piwik/pull/11383

* System tests

* Update valid UI tests

* Fix integration test

* System tests: enable images generation in scheduled reports

* prevent error if report does not support multiple periods

* updates expected test files

* Cells in email reports should reuse same font size and family

* Fix tests

* Fix the build

* UI tests

* Submodules

* UI test