WinGui: Stop using HandBrakeCLI to fetch preset information. Removing another instance where we rely on HandBrakeCLI.exe.  For now, it's just using a local copy of it's output that will be manually updated from now on. This changes infrequently so should not be an issue.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6563 b64f7644-9d1e-0410-96f1-a4d463321fa5