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You can now play/pause the render preview

w00ps, my bad, forgot this earlier :)

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 !)

Removed debug that I (obviously) merged badly in a previous commit

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

It now starts, load, and pause all by itself, without any intervention
of the TrackWorkflow, nor anything else.
Added some debug to detect a crash, the problem is probably inside of
the metadatamanager.

The aim is to launch a clip workflow, and let it start the playback, but
pause as the first frame.

Was returning -1 everytime...

This has only be tester with a Clip end date, not with an "unset" Clip
end.
Removed debug.

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