[FEATURE] Add plugins via the autoloader

Add the @plugin option for controller actions

Resolves: #62093
Change-Id: Id5d1d8879cefdfd1ab2f24e4292e4407ad53847f
Reviewed-on: http://review.typo3.org/33233
Reviewed-by: Tim Lochmüller <tim@fruit-lab.de>
Tested-by: Tim Lochmüller <tim@fruit-lab.de>