Big big refactoring :
Media aren't meant to be used anywhere, except when rendering. Clip can now have subclips, we avoid using uuid when using Clip* is possible. Correcting remaining crap in MediaListViewController and co. View handle as many things as possible, but do not touch data. ImportController doesn't have to do anything with deleting media. That's the MediaContainer's job. Probably many other things...
Showing with 286 additions and 355 deletions