MacGui: Add preset name used (or custom) to the queue and activity log

MacGui: Add preset name used (or custom) to the queue and activity log
- Courtesy of travistex
- Uses "Custom" if the settings do not reflect a preset
- Changed some names of functions in HBQueueController and added some comments
- The main controller now notifies the queue controller whenever jobs are added to libhb. This allows the queue to find out about such jobs without having to query libhb's job list periodically.

git-svn-id: svn://localhost/HandBrake/trunk@1179 b64f7644-9d1e-0410-96f1-a4d463321fa5