New attempt at fixing shit. Also some sprite stuff.

-Messed around with another air proc I saw runtiming on server.
-Attempted to fix overlays even further. Test run successful but you never know with random chances that hopefully are now as low as the test run let me see.
-Meddled around with transit space. 2 directions were missing a corrective step against negative rng output.
-Added otie snouts.
-Improved contrast in the corvid markings.
-Added tail wag sprites for husky and otie.

code/controllers/subsystem/air.dm

@@ -203,8 +203,9 @@ var/datum/subsystem/air/SSair
 	while (high_pressure_delta.len)
 		var/turf/open/T = high_pressure_delta[high_pressure_delta.len]
 		high_pressure_delta.len--
-		T.high_pressure_movements()
-		T.pressure_difference = 0
+		if (isturf(T))
+			T.high_pressure_movements()
+			T.pressure_difference = 0
 		if(MC_TICK_CHECK)
 			return
 
@@ -218,9 +219,8 @@ var/datum/subsystem/air/SSair
 	while(currentrun.len)
 		var/turf/open/T = currentrun[currentrun.len]
 		currentrun.len--
-		if (isturf(T))
+		if (T && isturf(T))
 			T.process_cell(fire_count)
-
 		if (MC_TICK_CHECK)
 			return
 

code/controllers/subsystem/processing/overlays.dm

@@ -99,8 +99,8 @@ var/datum/subsystem/processing/overlays/SSoverlays
 			overlays[i] = iconstate2appearance(overlays[i])
 		else
 			var/image/I = overlays[i]
-			appearance_bro.appearance = I
-			if(ishuman(src) || istype(src,/obj/item))
+			appearance_bro.appearance = overlays[i]
+			if(ismob(src) || istype(src,/obj/item))
 				overlays[i] = appearance_bro.appearance
 			else
 				appearance_bro.dir = I.dir
@@ -132,8 +132,8 @@ var/datum/subsystem/processing/overlays/SSoverlays
 			overlays[i] = iconstate2appearance(overlays[i])
 		else
 			var/image/I = overlays[i]
-			appearance_bro.appearance = I
-			if(ishuman(src) || istype(src,/obj/item))
+			appearance_bro.appearance = overlays[i]
+			if(ismob(src) || istype(src,/obj/item))
 				overlays[i] = appearance_bro.appearance
 			else
 				appearance_bro.dir = I.dir