Upgrades NSFW to use initialize() and SSoverlays

- Both as a first demonstration and as a practical bugfix, we upgrade the NSFW to use SSoverlay.   Instead of building a mutable_apperance and assigning it, we cut_overlays(), make our images, and call add_overlay() to queue it for compiling.
- We also must convert from using New() to initialize() becuase for annoying BYOND reasons,  some static variables in SSoverlays are not always instantiated before mapload.  So its important not to call overlays functions from New()  (We shouldn't be doing that ANYWAY for performance reasons, but now its even more true)

code/modules/vore/fluffstuff/guns/nsfw.dm

@@ -113,45 +113,33 @@
 	return ..()
 
 /obj/item/weapon/gun/projectile/nsfw/update_icon()
-	var/mutable_appearance/ma = new(src)
 	update_charge()
 
+	cut_overlays()
 	if(!chambered)
-		ma.overlays = list()
-		appearance = ma
 		return
 
 	var/obj/item/ammo_casing/nsfw_batt/batt = chambered
 	var/batt_color = batt.type_color //Used many times
-	var/list/newverlays = list()
 
 	//Mode bar
-	var/mutable_appearance/mode_bar = mutable_appearance(icon, "[initial(icon_state)]_type")
+	var/image/mode_bar = image(icon, icon_state = "[initial(icon_state)]_type")
 	mode_bar.color = batt_color
-	newverlays += mode_bar
+	add_overlay(mode_bar)
 
 	//Barrel color
-	var/mutable_appearance/barrel_color = mutable_appearance(icon, "[initial(icon_state)]_barrel")
+	var/image/barrel_color = image(icon, icon_state = "[initial(icon_state)]_barrel")
 	barrel_color.alpha = 150
 	barrel_color.color = batt_color
-	newverlays += barrel_color
+	add_overlay(barrel_color)
 
 	//Charge bar
 	var/ratio = Ceiling((charge_left / max_charge) * charge_sections)
 	for(var/i = 0, i < ratio, i++)
-		var/mutable_appearance/charge_bar = mutable_appearance(icon, "[initial(icon_state)]_charge")
+		var/image/charge_bar = image(icon, icon_state = "[initial(icon_state)]_charge")
 		charge_bar.pixel_x = i
 		charge_bar.color = batt_color
-		newverlays += charge_bar
-
-	ma.overlays = newverlays
-	if(ma.overlays.len != newverlays.len) //PANIC!
-		del(ma)
-		spawn(5)
-			update_icon()
-		return
-
-	appearance = ma
+		add_overlay(charge_bar)
 
 // The Magazine //
 /obj/item/ammo_magazine/nsfw_mag
@@ -169,49 +157,31 @@
 	max_ammo = 3
 	mag_type = MAGAZINE
 
-	var/list/modes
-
-/obj/item/ammo_magazine/nsfw_mag/New()
-	..()
-	modes = list()
+	var/list/modes = list()
 
 /obj/item/ammo_magazine/nsfw_mag/update_icon()
-	var/mutable_appearance/ma = new(src)
-
+	cut_overlays()
 	if(!stored_ammo.len)
-		ma.overlays = list()
-		appearance = ma
 		return //Why bother
 
 	var/x_offset = 5
-	var/list/newverlays = list()
-
 	var/current = 0
 	for(var/B in stored_ammo)
 		var/obj/item/ammo_casing/nsfw_batt/batt = B
-		var/mutable_appearance/cap = mutable_appearance(icon,"[initial(icon_state)]_cap")
+		var/image/cap = image(icon, icon_state = "[initial(icon_state)]_cap")
 		cap.color = batt.type_color
 		cap.pixel_x = current * x_offset //Caps don't need a pixel_y offset
-		newverlays += cap
+		add_overlay(cap)
 
 		if(batt.shots_left)
 			var/ratio = Ceiling((batt.shots_left / initial(batt.shots_left)) * 4) //4 is how many lights we have a sprite for
-			var/mutable_appearance/charge = mutable_appearance(icon,"[initial(icon_state)]_charge-[ratio]")
+			var/image/charge = image(icon, icon_state = "[initial(icon_state)]_charge-[ratio]")
 			charge.color = "#29EAF4" //Could use battery color but eh.
 			charge.pixel_x = current * x_offset
-			newverlays += charge
+			add_overlay(charge)
 
 		current++ //Increment for offsets
 
-	ma.overlays = newverlays
-	if(ma.overlays.len != newverlays.len) //PANIC!
-		del(ma)
-		spawn(5)
-			update_icon()
-		return
-
-	appearance = ma
-
 // The Casing //
 /obj/item/ammo_casing/nsfw_batt
 	name = "\'NSFW\' microbattery - UNKNOWN"
@@ -230,20 +200,18 @@
 	var/type_name = null
 	projectile_type = /obj/item/projectile/beam
 
-/obj/item/ammo_casing/nsfw_batt/New()
+/obj/item/ammo_casing/nsfw_batt/initialize()
+	. = ..()
 	pixel_x = rand(-10, 10)
 	pixel_y = rand(-10, 10)
 	update_icon()
 
 /obj/item/ammo_casing/nsfw_batt/update_icon()
-	var/mutable_appearance/ma = new(src)
-	ma.overlays.Cut()
+	cut_overlays()
 
-	var/mutable_appearance/ends = mutable_appearance(icon,"[initial(icon_state)]_ends")
+	var/image/ends = image(icon, icon_state = "[initial(icon_state)]_ends")
 	ends.color = type_color
-	ma.overlays += ends
-
-	appearance = ma
+	add_overlay(ends)
 
 /obj/item/ammo_casing/nsfw_batt/expend()
 	shots_left--