Turn on normal QUIT loop for Forth9900... and... we're off!
Rename source files to be less confusing.  Fix load when ROM size > FORTH size.  Add sound APIs.
Fix crash with bogus disk number
Integrate and fix some bugs in sound_synth, use for terminal beep
Allow 0 VDP interrupt rate
Implement MS
Apparently, IDLE on 9900 only works this way -- FIXME
IDLE cleanup
Minor cleanup
Sort symbols in .sym files... duh... tweak bell sound, move launches to common