3rd pass OOP

now we've got lists for parents, nodes, and air mixtures
(they're all broken)
moves tank.dm, cryo.dm, Freezer.dm to components/unary_devices/

code/ATMOSPHERICS/components/binary_devices/pump.dm

@@ -48,6 +48,9 @@ Thus, the two variables affect pump operation are set in New():
 	if(!on)
 		return 0
 
+	var/datum/gas_mixture/air1 = airs[1]
+	var/datum/gas_mixture/air2 = airs[2]
+
 	var/output_starting_pressure = air2.return_pressure()
 
 	if( (target_pressure - output_starting_pressure) < 0.01)
@@ -63,10 +66,8 @@ Thus, the two variables affect pump operation are set in New():
 		var/datum/gas_mixture/removed = air1.remove(transfer_moles)
 		air2.merge(removed)
 
-		parent1.update = 1
-
-
-		parent2.update = 1
+		update_airs(air1, air2)
+		update_parents()
 
 	return 1