MacGui: completed the HBVideo class.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6593 b64f7644-9d1e-0410-96f1-a4d463321fa5
MacGui: import some headers directly in HBJob.h.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6594 b64f7644-9d1e-0410-96f1-a4d463321fa5