Merge branch 'master' of https://github.com/Baystation12/Baystation12 into bs12_with_tgport

Conflicts:
	code/datums/disease.dm
	code/modules/reagents/Chemistry-Reagents.dm
	icons/turf/areas.dmi
	maps/tgstation.2.0.9.1.dmm

yep, this time going to merge map updates before making map changes >.>

Signed-off-by: Cael_Aislinn <cael_aislinn@yahoo.com.au>

code/game/objects/effects/decals/Cleanable/fuel.dm

@@ -0,0 +1,58 @@
+obj/effect/decal/cleanable/liquid_fuel
+	//Liquid fuel is used for things that used to rely on volatile fuels or plasma being contained to a couple tiles.
+	icon = 'icons/effects/effects.dmi'
+	icon_state = "fuel"
+	layer = TURF_LAYER+0.2
+	anchored = 1
+	var/amount = 1 //Basically moles.
+
+	New(newLoc,amt=1)
+		src.amount = amt
+
+		//Be absorbed by any other liquid fuel in the tile.
+		for(var/obj/effect/decal/cleanable/liquid_fuel/other in newLoc)
+			if(other != src)
+				other.amount += src.amount
+				spawn other.Spread()
+				del src
+
+		Spread()
+		. = ..()
+
+	proc/Spread()
+		//Allows liquid fuels to sometimes flow into other tiles.
+		if(amount < 0.5) return
+		var/turf/simulated/S = loc
+		if(!istype(S)) return
+		for(var/d in cardinal)
+			if(S.air_check_directions & d)
+				if(rand(25))
+					var/turf/simulated/O = get_step(src,d)
+					var/can_pass = 1
+					for (var/obj/machinery/door/airlock/door in O)
+						if (door.density)
+							can_pass = 0
+					if (can_pass)
+						if(!locate(/obj/effect/decal/cleanable/liquid_fuel) in O)
+							new/obj/effect/decal/cleanable/liquid_fuel(O,amount*0.25)
+							amount *= 0.75
+
+	flamethrower_fuel
+		icon_state = "mustard"
+		anchored = 0
+		New(newLoc, amt = 1, d = 0)
+			dir = d //Setting this direction means you won't get torched by your own flamethrower.
+			. = ..()
+		Spread()
+			//The spread for flamethrower fuel is much more precise, to create a wide fire pattern.
+			if(amount < 0.1) return
+			var/turf/simulated/S = loc
+			if(!istype(S)) return
+
+			for(var/d in list(turn(dir,90),turn(dir,-90)))
+				if(S.air_check_directions & d)
+					var/turf/simulated/O = get_step(S,d)
+					new/obj/effect/decal/cleanable/liquid_fuel/flamethrower_fuel(O,amount*0.25,d)
+					O.hotspot_expose((T20C*2) + 380,500) //Light flamethrower fuel on fire immediately.
+
+			amount *= 0.5