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This also fix a typo/bug when checking if a clip has already been
loaded.

Nothing else is saved, as we now use a QXmlStreamWriter. The file format
has changed.
Using forward declaration for class Media as soon as possible.

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...

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

Ho and please, don't clone an objet to get over its constness.

We don't need this anymore as Clip aren't stored in the Library.

This was just some kind of wrapper to the Media::addClip method

QDirModel will soon be outdated, QFileSystemModel is faster, uses its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

And when they are, please, check the return value...

Removed temporary medias from the library

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

Loading clips have also been implemented, but it cannot be tested.

There is a const baseClip on each media that correspond to the full media lenth.

All the medias are managed by the library now.