Use Draco Mesh Compression

[zicklag]

Use Draco mesh compression for mesh export and loading.

• Wrap Draco C++ library in Rust
• Use Draco when exporting meshes from the Arsenal
• Make sure Draco compression is supported for loading meshes in game

[bwasty]

We've discussed adding Draco loading support to the gltf crate a long while ago (I'm a contributor there -> https://github.com/gltf-rs). But it's a major project and so far there isn't even an issue - I would suggest opening one there to discuss it.

For generating the draco compressed file, it might be an option to use an external tool like https://github.com/TimvanScherpenzeel/gltf-to-glb (easier than directly writing draco I guess).

[zicklag]

Thanks. I created an issue: gltf-rs/gltf#242.

[zicklag]

Closing in favor of #93.