GLMixer Code

Re-implementation of single instance mechanism and re-implementation of
log file management. Now correctly detecting crash logs upon application
start.

compilation fix

Implementation of preference for fading duration of active/disable
rendering.

bugfix: display default cursor fading in timeline

Improved video synch to pervent backward jumps on some mp4 encoded time
stamps.

BugFix: restoring loading of groups in mixing view, and fixing limbo size
bug correctly.

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.