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This fixes a bug at first launch.

The renderer doesn't contain the dialog anymore.

A media that fail to load is automatically removed from the view (as
it's removed from the media container.)
Fixes #4

The import button is to be added when required.

Also removed old library widget ui file.

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...

Trying to use Clip* and Clip's UUID everywhere in the code.
This commit breaks a few things.

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

Old language is now restored when vlmc is launched again.

Menu shortcut weren't updated