Add renderer support for matrix uniforms.
Add renderer support for additional vec* uniforms.
Expose depth buffer to render code.
Expose stencil buffer to render code.

The intention is to provide a layer for tracking shadow
rendering, so a single bit is sufficient for now.
Support Vertex objects with custom z coordinate.
Add matrix helpers to Graphics.Util.
Implement vxl parser.
Implement hva parser.
Store the voxel normals table in a palette.
Add core voxel rendering code.
Allow mods to define voxel sequences.
Add a widget for UI voxels (e.g. colorpicker).
Integrate voxels with world renderer / render traits.