[TASK] Vendor support in ControllerActions ViewHelper

Hi Claus,
here is a draft for allowing vendor based extension for the ControllerActionsViewHelper. I guess this should be all, but currently I have not a good setup for testing it properly. I just got an email that someone finds out that vendor names aren't supported yet. 

Hope you might can give it a shot and merge it after.

Cheers,
domi