Chainsaw fix and cleanup (#4538)

* Fixes/Cleans up chainsaws.

* Further Chainsaw Updoots

code/game/objects/items/weapons/material/chainsaw.dm

@@ -1,19 +1,29 @@
 obj/item/weapon/chainsaw
-	name = "Chainsaw"
+	name = "chainsaw"
 	desc = "Vroom vroom."
 	icon_state = "chainsaw0"
+	item_state = "chainsaw0"
 	var/on = 0
 	var/max_fuel = 20
 	w_class = ITEMSIZE_LARGE
 	slot_flags = SLOT_BACK
 	w_class = ITEMSIZE_LARGE
 	slot_flags = SLOT_BACK
+	var/active_force = 55
+	var/inactive_force = 10
 
 obj/item/weapon/chainsaw/New()
 	var/datum/reagents/R = new/datum/reagents(max_fuel)
 	reagents = R
 	R.my_atom = src
 	R.add_reagent("fuel", max_fuel)
+	processing_objects |= src
+	..()
+
+obj/item/weapon/chainsaw/Destroy()
+	processing_objects -= src
+	if(reagents)
+		qdel(reagents)
 	..()
 
 obj/item/weapon/chainsaw/proc/turnOn()
@@ -31,7 +41,7 @@ obj/item/weapon/chainsaw/proc/turnOn()
 			visible_message("You start \the [src] up with a loud grinding!", "[usr] starts \the [src] up with a loud grinding!")
 			attack_verb = list("shreds", "rips", "tears")
 			playsound(src, 'sound/weapons/chainsaw_startup.ogg',40,1)
-			force = 55
+			force = active_force
 			edge = 1
 			sharp = 1
 			on = 1
@@ -44,7 +54,7 @@ obj/item/weapon/chainsaw/proc/turnOff()
 	to_chat(usr, "You switch the gas nozzle on the chainsaw, turning it off.")
 	attack_verb = list("bluntly hit", "beat", "knocked")
 	playsound(src, 'sound/weapons/chainsaw_turnoff.ogg',40,1)
-	force = 10
+	force = inactive_force
 	edge = 0
 	sharp = 0
 	on = 0
@@ -87,12 +97,13 @@ obj/item/weapon/chainsaw/process()
 	if(on)
 		if(get_fuel() > 0)
 			reagents.remove_reagent("fuel", 1)
+			playsound(src, 'sound/weapons/chainsaw_turnoff.ogg',15,1)
 		if(get_fuel() <= 0)
 			to_chat(usr, "\The [src] sputters to a stop!")
-			on = !on
+			turnOff()
 
 obj/item/weapon/chainsaw/proc/get_fuel()
-	reagents.get_reagent_amount("fuel")
+	return reagents.get_reagent_amount("fuel")
 
 obj/item/weapon/chainsaw/examine(mob/user)
 	if(..(user,0))
@@ -109,4 +120,4 @@ obj/item/weapon/chainsaw/update_icon()
 		item_state = "chainsaw1"
 	else
 		icon_state = "chainsaw0"
-		icon_state = "chainsaw0"
+		item_state = "chainsaw0"