GLMixer Code

Integration of the Fixed Size font Hack (Free) into the application
QFontDatabase for cross-platform portability of code & text editors.

Implemented some mechanisms to perform multiple attemps at loading a
VideoFile when loading fails, and to avoid openning and closing
VideoFile when file does not exists.

Bug Fix: make sure display of source is updated when changing view.

Improved dialog Web source.

Cleanup in Source Set (should avoid crash in case of poor use).

Bug Fix on web page loading problem.

Improvement stability Undo manager.

Incrementing version of GLM session file (lots of changes in FreeFrame
and Shadertoy plugin and source management).

Bug Fix in Source Set: test if object exists before performing
operation.

Bug Fix Mixer View Group display (do not crash when source is not
available)