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Removed debug.

Now we can have more than one media loaded...

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.