- Stop providing a buffered model supplier
- Instead, provide an IModel supplier
- IModel exposes basic properties of models
- IModel exposes a method to copy the model to a VecBuffer
- Move material stuff to its own package
- The various render functions in the material tree now bind to specific render layers
- Instancers can choose which layer to use
- The layers are SOLID, CUTOUT, and TRANSPARENT
- More layers are likely unnecessary, but we'll see
- Deprecate functions in MaterialManager in favor of more builderesque ones using MaterialGroups
