WinGui: Some Threading, Performance and Log window fixes.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5308 b64f7644-9d1e-0410-96f1-a4d463321fa5
manicure: fix setting acodec_fallback.



git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5309 b64f7644-9d1e-0410-96f1-a4d463321fa5
CLI: fix Auto Passthru for built-in presets.



git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5310 b64f7644-9d1e-0410-96f1-a4d463321fa5