Removing occurences of Piwik_ in core/

  * @subpackage is deprecated
  * @package must only occur once
  * @package supports nesting (and can match the namespace)

refs #4609
Remove all occurences of @package / @subpackage / @category from core/ files.

refs #4609
Remove remaining @package/@subpackage/@category declarations from plugins/

fixes #4609
Removing last Piwik_ occurences

refs #4609
Updating submodules
Merge branch 'master' into devicedetectionimprovements

Conflicts:
	plugins/DevicesDetection/functions.php