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This also fix the crash when clicking on play without any media loaded

Removed debug

Added some doc

Removed useless Track.cpp/h

... and render is stopped when there is nothing more to do

This way, the TrackWorkflow can return a black output when nothing has
to be rendered

However, they must NOT be simultaneous (for now !)

This is breaking compilation, you can blame me, ho yeah you can !

There's still a size/chroma/pitch/something_else problem, but this should work
soon :)

Corrected Clip workflow, seems kinda functionnal, but will need more
testing...

Please do not use 'this' pointer when it isn't required.

Added a tiny class for image handling
Added a Media class that will be the entrypoint for most of the timeline video
stuff
Code cleaning / reorganisation

Sorry for the big svn-like commit :p

Added a tiny class for image handling
Added a Media class that will be the entrypoint for most of the timeline video
stuff
Code cleaning / reorganisation

Sorry for the big svn-like commit :p