[MIRROR] Converts gas, ore, plants and reagent strings to defines (#9611)

Co-authored-by: Heroman3003 <31296024+Heroman3003@users.noreply.github.com>
Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>

code/game/machinery/doors/airlock.dm

@@ -482,23 +482,23 @@
 /obj/machinery/door/airlock/gold
 	name = "Gold Airlock"
 	icon = 'icons/obj/doors/Doorgold.dmi'
-	mineral = "gold"
+	mineral = MAT_GOLD
 
 /obj/machinery/door/airlock/silver
 	name = "Silver Airlock"
 	icon = 'icons/obj/doors/Doorsilver.dmi'
-	mineral = "silver"
+	mineral = MAT_SILVER
 
 /obj/machinery/door/airlock/diamond
 	name = "Diamond Airlock"
 	icon = 'icons/obj/doors/Doordiamond.dmi'
-	mineral = "diamond"
+	mineral = MAT_DIAMOND
 
 /obj/machinery/door/airlock/uranium
 	name = "Uranium Airlock"
 	desc = "And they said I was crazy."
 	icon = 'icons/obj/doors/Dooruranium.dmi'
-	mineral = "uranium"
+	mineral = MAT_URANIUM
 	var/last_event = 0
 	var/rad_power = 7.5
 
@@ -527,7 +527,7 @@
 	name = "Phoron Airlock"
 	desc = "No way this can end badly."
 	icon = 'icons/obj/doors/Doorphoron.dmi'
-	mineral = "phoron"
+	mineral = MAT_PHORON
 
 /obj/machinery/door/airlock/phoron/fire_act(datum/gas_mixture/air, exposed_temperature, exposed_volume)
 	if(exposed_temperature > 300)
@@ -539,7 +539,7 @@
 
 /obj/machinery/door/airlock/phoron/proc/PhoronBurn(temperature)
 	for(var/turf/simulated/floor/target_tile in range(2,loc))
-		target_tile.assume_gas("phoron", 35, 400+T0C)
+		target_tile.assume_gas(GAS_PHORON, 35, 400+T0C)
 		spawn (0) target_tile.hotspot_expose(temperature, 400)
 	for(var/turf/simulated/wall/W in range(3,src))
 		W.burn((temperature/4))//Added so that you can't set off a massive chain reaction with a small flame
@@ -551,7 +551,7 @@
 /obj/machinery/door/airlock/sandstone
 	name = "Sandstone Airlock"
 	icon = 'icons/obj/doors/Doorsand.dmi'
-	mineral = "sandstone"
+	mineral = MAT_SANDSTONE
 
 /obj/machinery/door/airlock/science
 	name = "Research Airlock"