Merge pull request #15011 from Putnam3145/lavaland-random-atmos

Port of randomized planet atmos

code/modules/atmospherics/gasmixtures/gas_mixture.dm

@@ -261,6 +261,8 @@ we use a hook instead
 	return 1
 
 /datum/gas_mixture/parse_gas_string(gas_string)
+	gas_string = SSair.preprocess_gas_string(gas_string)
+
 	var/list/gas = params2list(gas_string)
 	if(gas["TEMP"])
 		var/temp = text2num(gas["TEMP"])