Update README
Rename VIA to PIA

Preparing to create a PIA interface and one or more parallel
IO device implementations.
Split PIA into PIA/VIA6522
Fix missing repaint on Video Window
CRTC refactoring
Add CRTC EhBASIC, switch char rom.
More CRTC tinkering
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/main/java/com/loomcom/symon/machines/MulticompMachine.java