Parse UVs and other data in mesh files

[maxton]

Currently only the point and face data are being loaded from mesh files. It would be great to also have UV coordinates and whatever other data we are skipping (vertex colors maybe?).

• [x] UV coordinates
• [ ] Other stuff

[maxton]

I wanted to add a light to the mesh preview, but I realized we don't have vertex or face normal information. So maybe we should look into which bytes are the normals or if we'd have to compute those.