grafx - Extensible Java Graphics Package Code

Adding some cool options to Donut: CLIPPING_DEMO & COARSE_MESH.

Streamlining instantiations of DepthPolyEdge.

Adding class DepthPolyEdgePool. This is to recycle edges.

Paving the way for instance reuse of DepthPolyEdge.

Making some optimizations to Donut.

Making it possible to reuse a FloatColor instance.

Making some final improvements to Donut. The debugging code has been removed
for example.

Finally fixed the GOURAUD_SHADING in Donut. Still want to tie up some loose
ends though.

There is still a problem with Donut.

Got something working in Donut. Still debugging.