#2 perspecive transform

[Paul Gyugyi]

Change the default matrix to:
[0.707104 0 0.707104;
0.353553 0.866025 -0.353553;
-0.612372 0.5 0.612372]

and add a 4x4 projection matrix as
the final step in front of it.
Default should be "orthographic",
with identity matrix, but have an
option for the LDRAW default shearing
matrix of
[1.4142 0 0;
0 1.2196 -0.1124;
0 -0.7171 1.2247]
and add a perspective transform option.