WinGui:

WinGui:
- Added Global Event Handlers to parts of some of the user controls.
- Added register and deregister event handler functions for widget changes. (This allows the preset label to be changed to custom when a user changes a widget). This isn't finalised.
- Misc UI tweaks
- Few bug fixes:
    * Preset update notification appearing behind splashscreen
    * Tweaks to the preset loader to make it work a bit better.

git-svn-id: svn://localhost/HandBrake/trunk@2640 b64f7644-9d1e-0410-96f1-a4d463321fa5