GLMixer Code

Made limbo area scalable in the MixerView (mouse action and display of highlighted border)

Added property 'Transparent' to Algorithm sources
+ added corresponding items in AlgorithmSelection dialog
+ changed SourceDisplayWidget to show transparency

New splash screen for version 1.1 ! :)

Implementation of the 'FixedAspectRatio' property of sources
+ the associated entry in property manager and XML file.

fix bug display rendering source (not repeating texture)

Moved standy set mechanism to Source class (more generic) and moved standby testing area to MixerView to make the limbo area scalable.

Fixed few compilation warnings

Start Version 1.1
- ffmpeg compatibility to libavformat 53 (code and dependencies)
- GNU licence updated to 2012

Fix reading of GREYSCALE and PALETTE images ; to be continued as now the alpha channel is lost :(

Use of VideoFile filtering : bug fix for single frame media.