* "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

Added new events for scheduled tasks

* add support for email and url form fields

* UI test

* Add possibility to specify column suffix in dataTable row

In https://github.com/piwik/piwik/pull/11650 I added the possibility to define a column prefix to be displayed in the UI, this PR now also adds the same feature for suffix.

* remove the trailing whitespace

Login: No autocorrect and no autocapitalize on iOS

* update icon submodule

* fix UI tests

* fix system tests

* fix another UI test

* Fix system test

* fix #11681 make sure plugins in config.ini.php are sorted depending on dependencies

* added comment

* add missing tests

Integration test: CorePluginsAdmin.WeCouldNotLoadThePluginAsItHasMissingDependencies must use numbered placeholders instead of multiple %s

* fix a bug in the join generator

* add another test case to make sure the outer table foreach still works when removing an item

* throw exception if table cannot be joined automatically

* Add possibility to ignore "no data recorded" screen for one hour

* update screens

* update wording

* Add more plugin links

* added missing templates

* consistent font size

* UI tests show the new messages

Deactivating a plugin in case of a missing dependency is a bit risky. If just once a dependency is missing it would be directly deactivated. For example during an update we may run into an issue where a plugin dependency might be missing just for a short time frame. There may be also other edge cases where this might be the case. It would be better to instead trigger a notification only. I would show this notification only to super users but we do not have anything loaded at this time.

Any other ideas?

Let plugins customize the system summary widget