New getters for video presets, tunes, profiles and levels.

x264 is no longer the only encoder with a built-in preset system; QSV has its own presets, and supports setting the H.264 profile and level, too.

Old getters still in place for compatibility with the old API..



git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5883 b64f7644-9d1e-0410-96f1-a4d463321fa5
MacGui: update to the new preset getter API.



git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5884 b64f7644-9d1e-0410-96f1-a4d463321fa5