Git: Simplify code for action generation

Instead of returning (Action, Command) pairs for further modification,
pass in everything to setup the Command, and return only the Action.

Change-Id: I85695f2f35a9b9a1f34b00db7de5135909045e05
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
ProjectExplorer: Fix recent regression in kit matcher

Change-Id: I1268aae0a5063bf1ae0a144a99a9db70de508790
Reviewed-by: Lukas Holecek <hluk@email.cz>
Reviewed-by: hjk <hjk121@nokiamail.com>
Remove some dead code left over from the KitMatcher change

Change-Id: Ic3b23692615684df38157b00c9d361a6ae0a2f03
Reviewed-by: hjk <hjk121@nokiamail.com>