[vis] Use hacc::reference_file to load Programs
[vis] Expose a little more gl dealyboppers
[geo] Draw tilemaps.
[geo] Use per-pixel depth when drawing tilemaps.
[rata] Add running frames to image
[vis] Use vertex buffers.  Needs work.
[vis] Vertex attributes are now bound properly.
[geo] Put tilemaps in a VBO.
[vis] Allow flipping of sprites
[vis] Modernify graffiti.  Needs work.
[vis] Fix graffiti drawing.
[core] allow/show can list available phases/layers
[vis] Send z offset to sprites shader
[phys rata] s/Ambulator/Feet, make stats constants