[Feature] Add glTF 2.0 Import/Export

[dreamsyntax]

Consider using:
https://github.com/VPenades/SharpGLTF - but any library is fine or write your own.

Add import/export option for gITF model format, for geo and collision.
Read about gITF here:
https://github.com/KhronosGroup/glTF