GLMixer Code

Implementation for OSX of LibAVFoundation list of devices

Implementation for OSX of Camera input with Video Stream

Start to implement avdevice for Windows

Improved implementation of device selection dialog for webcams under
linux (list available devices).

Separate OpenCV from ability to create a device source.

Finalizing implementation of new Video Device source creation under
Linux, using libavdevice with video stream.

Added options for VideoStream format (useful for av device)

Generalizing VideoStream and VideoStreamSource to support avdevice
input.

Implementation of user preference for active or passive update timer.
glRenderTimer is a singleton that manages all update of rendering.
Recording enforces use of active precision update.

BugFix: do not use hardware decoding MJPEG for JPEG images.