And made them shorter in name. The new ascii.h file allow reuse in userspace
code.

It was a bad idea and having sms/pad interact directly with sms/vdp
is much simpler.

ref #64

It allows to see much more easily where the action happens on the screen.

This avoids having "ghost" chr selection sticking around.

This allows for outputting a character selection before it's given
through GetC. That allows a pad-oriented character selection scheme.