Removed some more old renderer stuff.
Removed SetColorKeyEnabled() completely (was no longer used anyway).
Bugfix: starting a table twice may cause a D3D error (reported by DHogsett). Reason: decal VB was not freed.
VP9 compatibility hack: pure black lights aren't rendered.
Added check for empty texture name in GetImage().
Lots of cleanup to walls rendering.
New issues: text decals don't work.
Converted playfield rendering to use index buffer.
Fixed a crash with the DX9 Debug runtime (anisotropic mag filter not supported).