Remove annotation 'use' statements from all core classes

As a follow up to
Annotation based plugins don't need a use statement anymore and #2090353: Change notice: Don't require to put the use statement into plugin classes , I offer this patch to remove all the 'use' statements for Annotation classes in the core plugins.

Yeah, it's big, but it only affects a few lines at the top of each file so the potential for conflicts is small.