grafx - Extensible Java Graphics Package Code

Carrying over the recent changes to edges & clipper to Gouraud shading tech.

Saving changes because I'm likely going to back everything out.

Pure comment changes. I want to save these comments, because as I'm writing
them I realized that we should do polygon clipping in a pre z normalized state.

Going over more of the 3D rendering code with a fine-toothed comb.

Making some minor revisions to 3D graphics, esp. as related to line drawing.
Mostly just declaring variables as 'final' where it can be done. Optimizing at
least one loop as well.

Adding long comment explaining choice of extents for m_fillPolyClip.

Adding computeIntColor() and friends.

Putting some of the Gouraud shading polygon fill code into nice loops.

Making some very minor improvements to loops and by adding 'final' in some
places.

Streamlining FlatPolyEdgePool & GouraudPolyEdgePool a bit.