MacGui: New Active Queue implementation courtesy of travistex

MacGui: New Active Queue implementation courtesy of travistex
- Thanks travistex!
- queue is now in a separate window
- queue currently shows jobs grouped together as one encode, which is configurable
- queue now shows currently encoding job, which is independently cancellable without losing the rest of the queue.
- can start and pause encoding in the queue window
- queue uses its own nib
- progress status needs work
- This has a way to go, but needed to get checked in as it changes the current xcode project structure.

git-svn-id: svn://localhost/HandBrake/trunk@925 b64f7644-9d1e-0410-96f1-a4d463321fa5