grafx - Extensible Java Graphics Package Code

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.

Adding a TODO comment to Donut.

Removing FloatStudy and making slight adjustments to rate of thetas in
LineRotate2D.

Greatly streamlining the line drawing routines, thanks to the recent changes
in m_lineClip strategy with upper and lower bounds to pixel(). I think the
changes are done for the most part. I still need to test and make some
adjustments, perhaps.

Continuing with the incremental line drawing routine simplifications. Removing
the 'alwaysTrue' code blocks.

In 2D graphics, making incremental changes which simplify the line drawing
code. Because m_lineClip now has the correct extents, replacing checks against
the m_clipXMin etc. values with 'alwaysTrue'.

In line drawing routines, now that m_lineClip has the correct boundaries, when
we go to compute xMin, yMin, xMax, and yMax for the pixels, we no longer need
the assistance of Math.min() and Math.max(), in other words we no longer use
m_clipXMin, m_clipYMin, m_clipXMax, and m_clipYMax as boundaries. This is a
rather delicate change but theoretically everything should work. Some simple
tests show that things still work the way they're supposed to. Unfortunately
I don't have extensive regression tests at the moment.