Editor: changed outliner to use FancySelect for nicer styling (using custom DOM instead of <select> element).

Work-in-progress, still some weirdness occurring.

Warnings are way too verbose for the moment.

It was creating problems with the Texture widget...

Just till we don't come up with something better ;)

Well, that input type="file" is much more uglier than I thought... 

Still not fully there.

Not sure about the exact details of the behavior or UI, but something like this is sorely needed when dealing with imported models.

Naming suggestions welcome...
Maybe *Importer and *Exporter instead of *Loader and *Saver?

Will be handy for modifying the near/far later.