Revert "12/21 modernizations from TG live"

code/game/objects/items/weapons/flamethrower.dm

@@ -9,10 +9,9 @@
 	throwforce = 10
 	throw_speed = 1
 	throw_range = 5
-	w_class = WEIGHT_CLASS_NORMAL
+	w_class = 3
 	materials = list(MAT_METAL=500)
 	origin_tech = "combat=1;plasmatech=2;engineering=2"
-	resistance_flags = FIRE_PROOF
 	var/status = 0
 	var/throw_amount = 100
 	var/lit = 0	//on or off
@@ -40,7 +39,7 @@
 	var/turf/location = loc
 	if(istype(location, /mob/))
 		var/mob/M = location
-		if(M.is_holding(src))
+		if(M.l_hand == src || M.r_hand == src)
 			location = M.loc
 	if(isturf(location)) //start a fire if possible
 		location.hotspot_expose(700, 2)
@@ -63,7 +62,7 @@
 /obj/item/weapon/flamethrower/afterattack(atom/target, mob/user, flag)
 	if(flag) return // too close
 	// Make sure our user is still holding us
-	if(user && user.get_active_held_item() == src)
+	if(user && user.get_active_hand() == src)
 		var/turf/target_turf = get_turf(target)
 		if(target_turf)
 			var/turflist = getline(user, target_turf)
@@ -189,7 +188,7 @@
 	for(var/turf/T in turflist)
 		if(T == previousturf)
 			continue	//so we don't burn the tile we be standin on
-		if(!T.atmos_adjacent_turfs || !T.atmos_adjacent_turfs[previousturf])
+		if(!T.CanAtmosPass(previousturf))
 			break
 		ignite_turf(T)
 		sleep(1)