Refs #4202 removing functions Piwik_GetOption and SetOption. Now use: Option::get and Option::set and Option::delete

refs #4199 added method to get all reports with goal metrics, otherwise it appears twice in the hooks documentation

added some of missing icons DevicesDetection brands -- cheers for PR!

Notes:
  - Allow integration tests to compare processed files against expected files of other tests.
  - Allow integration tests to modify apiNotToCall.

Refs #4204 Fix logic bug: setting Plugin schema version after they were successfully installed + should fix the build (thx ArchiveCronTest)

Use merged assets in tests, add ability to disable animation in realtime map, normalize age of visit in realtime map for screenshot test, and add data to fixture for new screenshot tests.