GLTF exporter as an option

[QuestionableM]

GLTF is much more efficient when it comes to large models, so I've decided to add it as a new export option.

The main reason is because gltf supports binary vertex data, which means we don't have to write vertices as ascii lines, which conserves a ton of space.

[TheCogster409]

this seems interesting. I think it would also be cool to maybe somehow bake in controller movement settings as an animation into the file, as GLTF supports animations unlike OBJ.
Although different controllers can activate at different times, and things like bearings and pistons can be hooked up to engines and switches respectively, and idk how that would play out or work. Maybe its possible to store seperate animations and play them individually? idk.