bugs:
	https://mods.factorio.com/mod/cybersyn/discussion/63a52e54be4341bccc0446f8

major:
	debug output
	add in game guide
	move to an event based algorithm
	models & art

minor:
	handle if signals are removed from the game during migration
	update wagon control combinators immediately upon placement
	railloader compat
	deadlocks signals compat
	close gui when the combinator is destroyed
	do not play close sound when a different gui is opened
	gui can desync if settings are changed outside of it while it is open
	give the combinators a sensible reaction to low or no power
	picker dollies compat?