* When choosing a autogenerated menuitem, we now create a new thread to
do the actual execution of this command. this is a (very ugly) workaround to the problem we were having with the deinterlace menu on osx. It works now, but now i'm running into the black screen and continous "late picture skipped (-218000)" again which is also plagueing us when you enter fullscreen with a filter enabled. This ought to be fixed before 0.6.0 as well.