Exporting GLTF

[Dantsz]

Hi, I've wanted to have the Warcraft III models as glTFs, but couldn't find any satisfactory converter from .mdl/.mdx to any usual format so I ended up exporting them using this project, here's my code in case it would be a useful feature.

• geometry is exported correctly (what I was specifically looking for)
• materials work enough to display the textures
• bone are exported, though not correctly
• also added filtering geosets exported on whether or not they're present during a specific animation