grafx - Extensible Java Graphics Package Code

Finally, adding 3D graphics library. This has really matured quite a bit. I
would still like to expose some decent test code somehow; right now the Donut
test code, which is really superb, has some dependencies that I don't want to
include.

Removing TODO.txt for 3D graphics lib, already done all of it. Thanks.

Removing extra 'demo' and 'img' code.

Moving over the latest and greatest 2D rendering library. Mostly improvements
in the alias(), pixel(), simplifications in line drawing via better choice of
m_lineClip.

Redoing some aspects of combinatorics (combinations of options) in Donut.

Giving the same optimization/simplification treatment to color interpolated
line drawing. All of this made possible because of smart choice of m_lineClip.

Removing the 'withinBounds' code blocks in constant color line drawing
routines.

Removing the Math.min() and Math.max() calls from line drawing routines,
constant color, because m_lineClip is more effective now.

Setting m_lineClip to use the pixelLowerBound() and pixelUpperBound()
coordinates.

Adding pixelLowerBound() and pixelUpperBound() to 3D graphics code,
RasterDepthGraphics.