grafx - Extensible Java Graphics Package Code

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.

Modifying m_lineClip to use pixelLowerBound() and pixelUpperBound().

Adding LineIntegrityCheck1 and LineIntegrityCheck2.

Adding pixelUpperBound() and pixelLowerBound().

Rearranging location of code snippets.

Did some basic tests of fixed 3D rendering code; it works.

Fixing the degenerate cases in line drawing.

Removing the s_strategy nonsense.