WinGui:

WinGui:
- Nested Presets bar (Built-in presets only)
- Both user and built-in presets are now stored in XML files
- Preset bar now has right-click menu with: Expand All, Collapse All and Delete

Known Issues:
- When a preset is removed, all items in the preset bar with child presets are collapsed.
- Right Click menu only works if the preset was selected before right clicking.

Code is probably a bit buggy so all feedback on this new bar is welcome.

git-svn-id: svn://localhost/HandBrake/trunk@1866 b64f7644-9d1e-0410-96f1-a4d463321fa5