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Conflicts:
	src/Workflow/ClipWorkflow.cpp
	src/Workflow/MainWorkflow.cpp
	src/Workflow/MainWorkflow.h
	src/Workflow/TrackWorkflow.cpp
	src/Workflow/TrackWorkflow.h
	src/gui/MainWindow.cpp
	src/renderer/WorkflowRenderer.cpp

This also solves a "lag" problem.

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...

Not needed anymore.
This reverts commit c7f780d7.

The crash occured when the first known position of the newly added clip
was exactly at the position of another one.

Removed useless comments
Removed useless constructions of QFileInfo when creating a new Media instance.
Corrected header

Adapting MediaProperty window to use Clip

Conflicts:
	src/renderer/WorkflowRenderer.cpp
	vlmc.pro

This commit contains some crappy-things, such as a call to the mainloop
during a layout re-organisation and should be removed ASAP.

the MediaLibrary contains all of the media, but only gives access to the Clip, created upon the medias.
Cleaned metadata process: the clip doesn't appear inside of the mediaLibrary until the metadata process has been completed.
Removed junk/useless code