This version is a intermediate version in the attempt to port tetris to OpenGL,
currently all of the "easy" conversions are implemented in Shared.h,
but there are still IrisGL windowing commands in Rotor.C and main.C,
the problem functions are documented in unknown.txt.

About to start extracting segments from the main loop and moving the commands into the GLUT loop, in particular things like "holding" the ALT-8-2 can be redone with the keyboard callback in GLUT and the unsigned char = 'ALT' & '8' & '2', i.e. with bit-wise ANDs.
