GLMixer Code

BugFix saving enable status of freeframe plugins

Finishing implementation of lumakey (needs to update version of
preferences)

Initial implementation of lumakey color manipulation effect in sources.

Replace bloompaint example shadertoy effect with greenscreen simple example.

New Chromakey implementation.

Saving the original Nico picture in the repository for future use.

BugFix FreeFrame Shader; clear frame buffer between frames.

Improved freeframe plugin test example code.

Adding fading to simplified fragment shader too...

Cosmetics & cleanups.