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Signed-off-by: Yikai Lu <luyikei.qmltu@gmail.com>

I don't know why this happend... So shameful

Because spaces will be automatically inserted

- Add missing headers
- Let the framework handle background generation of the thumbnails
- Let the framework handle the caching
- Use Image instead of Pixmap, since the later might not be usable
outside of UI thread

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

Have a specific getter when we actually want the library clip to be
returned.

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>

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