Do not emit the signal from outside of the class
Remove GUIMedia class

This introduces 3 interfaces:
- IBackend: Provides the very basic functionnalies associated to a media
  backend (log hook & creating sources)
- ISource: Provides functionnalities associated to a media source. Basic
  metadata handling & spawning renderers to use this source
- IMemorySource: Describe a source which is described programmaticaly
  and fed from memory
- ISourceRenderer: Allows one to render and configure render options.

On paper, this is feature complete with regards to the old
implementation.
In practice, it is not, and pretty much all media related
fonctionnalities are broken, and will require further refactoring to
become functionnal again.

Signal was connected after the metadata computing was started.
If metadata computing appens to end before the signal is connected,
things can go wrong.

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

For now, files are just copied to the specified workspace directory.

Fix forward declaration of QXMLStreamReader, breaks on Mac OS; see a discussion here: http://lists.trolltech.com/qt-interest/2008-07/thread00798-0.htmlSigned-off-by: Hugo Beauzée-Luyssen <beauze.h@gmail.com>

Fixed other warnings

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...

This doesn't restore the functionnality yet.

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.

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

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

Adding track count to clip property window

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

Working but need a fix (see the comment in the code)