Atmos machine update

Takes a pass at updating ATMOSPHERICS to take advantage of the new powernet changes.

Also removes var/on definitions from many atmos machines. Machines generally shouldn't
be doing "on" things if they aren't using power, and most players don't expect a machine
to use power if it isn't "on," so I guess this is fair game.

Also, further refactoring.

code/ATMOSPHERICS/components/trinary_devices/trinary_base.dm

@@ -1,9 +1,7 @@
 obj/machinery/atmospherics/trinary
 	dir = SOUTH
 	initialize_directions = SOUTH|NORTH|WEST
-	use_power = 1
-
-	var/on = 0
+	use_power = 0
 
 	var/datum/gas_mixture/air1
 	var/datum/gas_mixture/air2