MacGui: Picture Filters Inspector enhancements

MacGui: Picture Filters Inspector enhancements
- Add custom settings fields to Detelecine, Decomb, Deinterlace, and Denoise.
- Add a two position slider to choose between Decomb and Deinterlace (can no longer run both in the macgui).
- Update Presets, Queue, and Live Preview code accordingly.
- Moved Grayscale to the Filters inspector and removed it from the main window.
- Changed the style of the buttons on both the settings and filters inspectors to better fit in with HUD.
Known Issues:
- Resizing of the inspector to show/hide the custom fields is a touch ugly.
- Setting the filter to "Custom" then not using a custom string, results in default from libhb, though should probably error trap against that actually.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@2114 b64f7644-9d1e-0410-96f1-a4d463321fa5