GLMixer Code

Implementation of Undo for creation / deletion of sources.

Bug Fix: fill_first_frame when stop using FirstFrameFiller.

Bug Fix: provide framerate for FreeFrame source.

Bug Fix: apply depth when loading FreeFrame source.

Recursive loopback: improved user preference.

Re-implementation of RenderingSource to enable non-recursive loopback.
This required a change in rendering pipeline of sources in Views and
RenderingManager. Added GUI and session file saving for RenderingSource
creation.

Link to GLMixer documentation for OSC.

Implemented preference for saving session on exit. Fixed minor GUI bugs.

Completed implementation of OpenSoundControlManager (enable/disable,
user preference, most source manipulation properties exposed).

Changed names of method of Proto Source to match the name of the
property associated (e.g. Posterized replace numberOfColors).