* Replace all occurences of Piwik in english translations of Actions plugin
* translation update
* Replace all occurences of Piwik in english translations of API plugin
* translation update
* Replace all occurences of Piwik in english translations of core
* replace Piwik occurrences
* Rename widget piwik.org blog => matomo.org blog
* fix widget name
* replaced some more piwik mentions
* Renamed to Matomo a few strings
* Replaced more strings to Matomo in JSON files, twig templates
* Replaced more strings to Matomo in INI file
* Replaced more strings to Matomo in API docs, error messages, feedback forms
* introduce API.getMatomoVersion and ExampleAPI.getMatomoVersion API + deprecate old ones
always load all translations of all plugins that are not 3rd party and bogus. As the translation file will be cached the time to load the translation drops from > 10ms to 1ms