Suspicious Shapes

Initial release!

Late additions:

• Will not load models without the following key-value-pair on the child model: "loader": "suspicious_shapes:gltf" - this is to let other model loaders know we're here, and to avoid clobbering their models.
• Some previously-broken untextured models will now load. Faces with no textures specified will act like an "#all" up-reference, subject to change in future versions.

Known Issues

• obj+mtl loading isn't in yet, but is planned for the future. Its loader key will be "suspicious_shapes:obj".
• vertex colors aren't yet honored. This is also planned for the future.