This includes the memory allocator and the morgue.
You can't actually write any data to the buffer yet, since we don't have
commands or temp buffers. Temp buffers (scratchpads) are coming soon.
- rm dynamicIndexing and nonUniformIndexing, for now (arrays aren't well
supported)
- rename compressed texture features
- move clip/cull distance to limit instead of feature (limit can be 0)