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Every uuid is now located in a clip. To select a media, use its base
clip's uuid.

... as it does nothing more than MediaCellView

The previewwidget isn't meant to emit a signal about a clip beeing
added.
Let this to the media, as it holds the clips.

QDirModel will soon be outdated, QFileSystemModel is faster, uses its
own thread, and check for filesystem changes by itself.
Also: Removing useless attributes from Library

Removed endless ping-pong between library and import when a media is
imported.

Removed temporary medias from the library

- Extends to 2010.
- Use VideoLAN as new legal entity.

This reverts commit 86f08902.
This breaks render to a file. Please test your changes.

All the medias are managed by the library now.

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