Merge branch '2.x-dev' into 3.0-m09

CHANGELOG.md

composer.lock

config/global.php

core/ArchiveProcessor/PluginsArchiver.php

core/Config.php

core/Db/Adapter.php

core/Plugin.php

core/Plugin/Archiver.php

core/Plugin/ControllerAdmin.php

core/Tracker/TrackerCodeGenerator.php

core/Tracker/VisitExcluded.php

core/Updater.php

core/Updates/2.16.3-b3.php

core/Updates/2.16.3-rc2.php

core/View.php

js/piwik.js

js/piwik.min.js

lang/en.json

lang/es.json

lang/it.json