grafx - Extensible Java Graphics Package Code

Using m_foff for the color interpolating line drawing routines. It works, but
we can't immediately see an immediate gain in accuracy. The old way of doing
things only theoretically was less accurate, and I was never able to get a bad
pixel even in the old way of doing it.

In ImmediateModeGamePlayback, making it easier for example to print out the
name of next block.

Adding m_clipYMax2, m_clipYMin2, m_clipXMax2, and m_clipXMin2 during the
transition period.

Updating some test code.

Making a more accurate calculation of m_clipYMax, m_clipYMin, m_clipXMax, and
m_clipXMin, but casting to 32 bit floating point after offsetting by the
dimensions of the canvas.

Adding some test code which exposes the flaws in the casting method of epsilon
proximity calculations.

Finished refactoring the line drawing code for constant color.

Moving xx, yy, and inx local variable definitions out of the four constant
color line drawing routines, into the parent function, passing them as input
parameters.

Paving the way for refactor of the constant color line drawing code.

Streamlining some more of the color interpolated line drawing code; instead of
explicit zMin and zMax, using the arrays m_zargbMin & m_zargbMax.