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

Removed debug

YOUHOU, FIRST CODE COMMIT, YAY SACRIFICE PONIES!
(Don't be afraid, I love ponies, it's a friendly sacrifice)

Added some doc

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