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The Main/Tracks workflow remains really basic...

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

It just lacks a few graphic polish (for the sliders)

This seems to breaks a few things (or at least I observed crash that didn't
occured before, but maybe that's VLC 1.1 :D

Corrected crash when launching
Added render preview widget in UI
Deleted unused VLCMediaList

There's now a central widget that dispatch preview to a ClipPreviewWidget class
if it's a clip In a close future, there will be a RenderPreviewWidget class

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

Removed useless stuff from VLCMedia

Add of the sound graph on the timeline. It's unstable for the moment so it's not activated by default.
To activate the sound graph rendering, uncomment the startAudioDataParsing() line on the MetaDataManager.cpp