* trim event values before checking if they are empty

* Prevent possible archiving failures for already tracked empty event categories

* Throw exception when tracking events with empty category or action

* move trim method

* Log console error when tracking events without category or action

* rebuilt piwik.js

* fix typo

* rebuilts piwik.js

* disable outgoing communication with one setting

* disabled piwik blog if isInternetEnabled=0

* better description for enable_internet_features

* reenable plugin

* Make it possible to view Ecommerce Log with segment

* adds UI test for segmented ecommerce log

* adds screenshot for UI test

* use Http::buildQuery()

* ensure version numbers are always the same

* try to fix ui test

* updates expected screenshots

* fix remaining overlay ui test

* 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

Make TrackerUpdater a public API

* use DI so plugins can change custom piwik js

* post event so plugins can customize which tracker files to include

* better API so we can write better tests