auxgm part 1

see also https://github.com/Baystation12/Baystation12/blob/dev/code/modules/xgm/xgm_gas_data.dm

code/modules/hydroponics/grown/misc.dm

@@ -58,7 +58,7 @@
 		return
 
 	var/datum/gas_mixture/stank = new
-	stank.adjust_moles(/datum/gas/miasma,(yield + 6)*0.14) // 0.14 = 7*0.02, this process is only being called about 2/7 as much as corpses so this is 12-32 times a corpses
+	stank.adjust_moles(GAS_MIASMA,(yield + 6)*0.14) // 0.14 = 7*0.02, this process is only being called about 2/7 as much as corpses so this is 12-32 times a corpses
 	stank.set_temperature(T20C) // without this the room would eventually freeze and miasma mining would be easier
 	T.assume_air(stank)
 	T.air_update_turf()

code/modules/hydroponics/grown/towercap.dm

@@ -226,7 +226,7 @@
 		var/turf/open/O = loc
 		if(O.air)
 			var/datum/gas_mixture/loc_air = O.air
-			if(loc_air.get_moles(/datum/gas/oxygen) > 13)
+			if(loc_air.get_moles(GAS_O2) > 13)
 				return TRUE
 	return FALSE