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Now, adding a media set the project in an unclean state, which avoid
beeing able to close without saving when a media has been loaded without
saving the project afterward.

The Workspace part isn't fully fonctionnal yet.

Everything will be stored in a project dir.
This is probably not functionnal as it is, and require much work.

Signed-off-by: Hugo Beauzée-Luyssen <beauze.h@gmail.com>

Signed-off-by: Ludovic Fauvet <etix@l0cal.com>

Adding a contextual menu to the MediaCellView so the action can be
triggered manually.

Actually this was not needed, and was breaking the project loading :)

This was clearly not a good way of checking for the existance of an
element in a QHash...

For now, files are just copied to the specified workspace directory.