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Because spaces will be automatically inserted

Signed-off-by: Hugo Beauzée-Luyssen <hugo@beauzee.fr>

We now duplicate the clips when resizing, otherwise multiple clips would
share the same begin/end during the resize

This was rejecting a move from a track to another one if the clip was
moved to the exact same position

This removed the formats from clip, in favor of a "isAudio" boolean
flag

Instead we now have a small structure containing an "instance" of a
clip, in the workflow
This instance ID needs to be used when manipulating clips from the
timeline

Signed-off-by: Hugo Beauzée-Luyssen <hugo@beauzee.fr>

Signed-off-by: Hugo Beauzée-Luyssen <hugo@beauzee.fr>

Signed-off-by: Hugo Beauzée-Luyssen <hugo@beauzee.fr>

Clip linking isn't available yet

Media is now the sole owner of clips. A clip doesn't have any child.
The project file now saves the media & clips as a tree.

This breaks the loading of sequence workflows and is likely to crash
until all Clips are being exposed as shared_ptr/QSharedPointer

Sorry, this was a very bad mistake....