WZ4: Request. Normal Maps support for several yellow ops.

[Skinnytorus]

hi, ryg.
Many thanks for the BlowNoise! As you mentioned in your comment on Issue #59, I might submit a request for adding normal maps to other yellow ops.
So here they are:

1. Trails
2. Ribbons (Edit - already done by wzman)
3. Ribbons2 - (Edit - already done by wzman)
4. Marching cubes
   and probably FR063 AermelKanal (it might be a good idea to apply normal maps to the walls of the tunnel :))
   Thank you.