MacGui: Be Gone x264 (h.264 iPod) encoder drop down!

MacGui: Be Gone x264 (h.264 iPod) encoder drop down!
- Added an "Insert iPod Atom" checkbox right under "HTTP optimized" checkbox which sets job->ipod_atom = 1; in prepareJob if checked (Note: the name of the checkbox is currently up for debate, we are taking suggestions though the current name is most indicative of what it does).
-Level is now handled in the advanced panel opt strings for x264 and width is no longer sanity checked by the gui.
- Changed the remaining x264 (Main) to just x264
- Modified preset code to account for legacy presets from old dropdowns
- Modified built in presets to include "level=30" for iPod / iPhone presets NOTE: Update your built in presets if you want the iPod and iPhone presets to be compatible.
- Removed the "Reset Picture to 640 for x264 iPod" preference from the Preferences -> Picture panel.

git-svn-id: svn://localhost/HandBrake/trunk@1216 b64f7644-9d1e-0410-96f1-a4d463321fa5