MacGui: added support for NLMeans denoise. Added the HBFilters class to store the filters settings, previously they were stored directly in the HBPictureController window controller.
Removed the filter tab animations for now, they will be added back later.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6319 b64f7644-9d1e-0410-96f1-a4d463321fa5