Merging with alteredq's branch.

Also some fixes along the way to properly handle vertex colors in loaders.

Many things still broken, but we move forward.

About to try to bring Face4 back.

Fixed some examples that used ParticleCircleMaterial.

Tons of things still broken.

Getting closer though still having some junk data poping out here and there.

Fixed uv handling on Projector (forcing channel 0 by now)

Commit to be able to merge with mrdoob.

Not tested yet, as the rest of the engine doesn't work yet.

Work in progress, not expected to work yet.

(among other things, we don't deal yet with new vertex colors for particles/line/ribbons, for the moment they just use geometry.colors as before, also we need to specify which type of uvs to use somewhere, analogous to which type of vertex colors to use)

Binary loader was not yet refactored to use new format, which means it supports only subset of possible face types.

It's not expected to work yet, we will need to test it once exporters / converters are also changed to new format.