MacGui: Chapter Title import/export functionality

MacGui: Chapter Title import/export functionality
- Saves the chapter list to a .csv file which is compatible with the cli and wingui.
- Note: comma's in the chapter name are escaped with a "\" to maintain cli compatibility then if necessary stripped upon re import into macgui.
- Original patch by borgclone and added to by realityking. Thanks!
- Feature development referenced here http://forum.handbrake.fr/viewtopic.php?f=4&t=4146&start=0

git-svn-id: svn://localhost/HandBrake/trunk@3285 b64f7644-9d1e-0410-96f1-a4d463321fa5