MacGui: Queue Enhancements courtesy of travistex

MacGui: Queue Enhancements courtesy of travistex
- Encodes now stick around in the queue's displayed after they have been completed. They are marked with a check mark icon.
- The "active" encode is shown with a chasing arrows icon.
- Completed encodes have a spotlight icon by them to allow you to show in finder
- Support for reordering encodes in the queue via drag and drop. Currently #define'd out because there's currently no easy way to reorder hblib's job list. But some day maybe...

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@1017 b64f7644-9d1e-0410-96f1-a4d463321fa5