removed unused code

There's no need to keep this piece of code
not only is it not needed anymore, it was also
very badly written. It could have been implemented
_much_ better like this (not tested):

LD	IYH, 0
LD	IYL, E
LD	E, 64
MLT	DE
ADD	IY, DE
Merge branch 'master' into monitor
added binary sprite data generator script
save 1 byte and 1 cycle. yeah...

Premature optimization is the root of all evil. And I'm very evil.
http://wikiti.brandonw.net/index.php?title=Z80_Optimization
added help dialog icon, hide cursor
Merge remote-tracking branch 'origin/gfx'

adds graphical improvements (icons)