Model loading using .gltf or .glb

[erwanvivien]

I have been working from the base work of @whoisryosuke's play/gltf-r2 on loading assets of .glb format and .gltf format

I think it works quite well and if you'd like I could do a PR to extend the Intermediate part and add it, it should interest people and leaves a trace of the research work I have done :).

Current working implementation can be found here: erwanvivien/mjolnir.git:resources.rs

[sotrh]

Looks good. I've been considering having some "guest articles" with topics I'd like to cover, but haven't had the time to write up.