WinGui: Couple of minor UI tweaks and new tooltips.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5166 b64f7644-9d1e-0410-96f1-a4d463321fa5
WinGui: Some Layout improvements to the Advanced tab to make it clearer what section the options come under.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5167 b64f7644-9d1e-0410-96f1-a4d463321fa5
WinGui: Numerous bug fixes. Many around the automatic selection feature on the Audio Panel.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5168 b64f7644-9d1e-0410-96f1-a4d463321fa5
WinGui:  Options screen refactoring.
Help -> Check for updates now takes the user to the options screen update tab.
Help -> About now takes the user to the options screen about tab.  Saves popping up annoying window.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5169 b64f7644-9d1e-0410-96f1-a4d463321fa5
LinGui: Add GTK+-3 support


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5170 b64f7644-9d1e-0410-96f1-a4d463321fa5