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If a backup file is more recent than the actual project file, the user
is asked if she wants to load the backup.
If an outdated backup is found, it can be deleted.
Code has been cleaned up a bit.

Fixes #88

If the end is reached before we stopped the media, there's something
wrong !

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

It's connected to the ClipWorkflow's error signal in the ClipWorkflow
constructor.

Removing useless methods.
This commit should solve some potential deadlocks

Except for the LightVideoFrame that are still used.

Right now, the FPS and resolution fields are hidden when an audio file
is displayed.

This intend to avoid duplicated code between the ClipProperty widget and
the ImportController.
Second step will be to adjust what's displayed, depending on the file
type. IE: Displaying FPS for an audio file is silly.

Fixed other warnings

Splitting the stopping process in three parts : first stopping the
ClipWorkflow media player, stopping the renderer, and put the workflow
in a stopped state.
This seems to improve the perfs with a MOV sample, though i don't really
see why it would...

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