GLMixer Code

New Selection Manager, with simplified tags management and clean play
control toolbar. Removed control for smooth pause (to be implemented per
videofile instead).

Simplified and clean implementation of session switcher widget without
proxy view.

Implementation of performance mode for session switcher (with its load
of bugfix and improvements).

Project for snapping mechanisms in views

Change order of logs testing: prevents processing app events before init
og glmixer instance.

Do not offer playback options for single frame media.

Improved manipulation of snapshot view (double clic enabled, zero
duration animation for direct restore of temp and destination snapshots)

oops: restore testing of depth boundary

Fixed behavior of snapshot interpolation in render view. Improved
behavior for setting depth in rendering manager.

Improved crop tool in geometry view: allow grabbing the whole texture
coordinates to shift texture inside source.