WinGui: 
- When switching between the video tab and advanced panel, set the advanced tab's advanced query string from the x264 preset.
- Add a copy full query context menu to the "extra options" text box.
- Auto set the Picture settings mode on the Add Preset window.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5673 b64f7644-9d1e-0410-96f1-a4d463321fa5
WinGui: Some fixes around the Video and Advanced Tab query generation behaviour.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5674 b64f7644-9d1e-0410-96f1-a4d463321fa5