grafx - Extensible Java Graphics Package Code

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.

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'.