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This reverts commit bd9b98fa.

Conflicts:

	src/Commands/Commands.hpp

An EndReached ClipWorkflow now returns a black output, to avoid displaying the same frame too long when approaching end of a clip

Revert "End of a track is now handled by a signal emitted from the ClipWorkflow, in horder to avoid hangs up"

This reverts commit f2ef00a9.

Conflicts:

	src/Workflow/TrackWorkflow.cpp

End of a track is now handled by a signal emitted from the ClipWorkflow, in horder to avoid hangs up

However, at the moment, the first frame isn't displayed... we need to move the position slider to get one...

IE you can pause the preview, but still change the position, and the render gets updated.

This is really much cleaner than the old versions...

However, due tu the nature of clipworkflow control, a lot of frames are
lost...

Pause can be toggled until every single ClipWorkflow of every single TrackWorkflow has been paused.

This reverts commit df19117a.

This reverts commit c277adec.

This reverts commit 27b832c3, reversing
changes made to c277adec.