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An issue still remains in the undo/redo code and will be fixed asap.

Conflicts:
	src/GUI/MainWindow.cpp
	src/GUI/MainWindow.h
	src/GUI/Preferences.cpp
	src/GUI/Preferences.h
	src/GUI/ui/Preferences.ui
	src/LibVLCpp/VLCException.cpp
	src/gui/LanguagePreferences.cpp
	src/gui/PreferenceWidget.h
	src/gui/Preferences.cpp
	src/gui/Preferences.h
	src/gui/ui/LanguagePreferences.ui
	src/gui/ui/Preferences.ui
	vlmc.pro

Warning: I'm not saying that it worked... just that i doesn't crash :D

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

This shouldn't improve performance so much, but it's better to do nothing if nothing has to be done ain't it ?

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

This reverts commit f966e799.

This reverts commit 56a33199.

Conflicts:

	src/Workflow/MainWorkflow.cpp
	src/Workflow/TrackWorkflow.cpp

This reverts commit 92f2f1f5.

Note to myself: loops work better when incrementing iterator...

This will allow Clips to be muted, and it allows a clip that just ended not to be restarted immediatly

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

This class isn't a QDialog anymore, and inherits WorkflowRender