MacGui: change the queue to work with serialized HBJob objects, remove the NSDictionary job representation and the duplicate prepareJob method. Implement NSCopying protocol in HBJob.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6655 b64f7644-9d1e-0410-96f1-a4d463321fa5
MacGui: remove unneeded init.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6656 b64f7644-9d1e-0410-96f1-a4d463321fa5
MacGui: rename PictureController.* to HBPictureController.* .

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6657 b64f7644-9d1e-0410-96f1-a4d463321fa5