MacGui: Custom chapter names restored (borked in 1703)

MacGui: Custom chapter names restored (borked in 1703)
- The chapter names are now stored in the queue as the key "ChapterNames" which has an array of names as its value and are re-applied to the job when the queue goes to that encode if applicable.
- As with all things, should save some work if you use a lot of custom chapter names and you have to shut down during a long queue encode and restart later.

git-svn-id: svn://localhost/HandBrake/trunk@1730 b64f7644-9d1e-0410-96f1-a4d463321fa5