Port current /tg/ lighting system

code/modules/reagents/reagent_containers/glass.dm

@@ -182,7 +182,7 @@
 	update_icon()
 
 /obj/item/weapon/reagent_containers/glass/beaker/update_icon()
-	overlays.Cut()
+	cut_overlays()
 
 	if(reagents.total_volume)
 		var/image/filling = image('icons/obj/reagentfillings.dmi', src, "[icon_state]10")
@@ -198,11 +198,10 @@
 			if(91 to INFINITY)	filling.icon_state = "[icon_state]100"
 
 		filling.color = reagents.get_color()
-		overlays += filling
+		add_overlay(filling)
 
 	if (!is_open_container())
-		var/image/lid = image(icon, src, "lid_[initial(icon_state)]")
-		overlays += lid
+		add_overlay("lid_[initial(icon_state)]")
 
 /obj/item/weapon/reagent_containers/glass/beaker/large
 	name = "large beaker"
@@ -309,10 +308,9 @@
 		return ..()
 
 /obj/item/weapon/reagent_containers/glass/bucket/update_icon()
-	overlays.Cut()
+	cut_overlays()
 	if (!is_open_container())
-		var/image/lid = image(icon, src, "lid_[initial(icon_state)]")
-		overlays += lid
+		add_overlay("lid_[initial(icon_state)]")
 
 obj/item/weapon/reagent_containers/glass/bucket/wood
 	desc = "An old wooden bucket."

code/modules/reagents/reagent_containers/spray.dm

@@ -232,7 +232,7 @@
 /obj/item/weapon/reagent_containers/spray/chemsprayer/hosed/update_icon()
 	..()
 
-	overlays.Cut()
+	cut_overlays()
 
 	if(!hose_overlay)
 		hose_overlay = new icon(icon, "[icon_state]+hose")

code/modules/reagents/reagent_containers/syringes.dm

@@ -232,7 +232,7 @@
 	return
 /* VOREStation Edit - See syringes_vr.dm
 /obj/item/weapon/reagent_containers/syringe/update_icon()
-	overlays.Cut()
+	cut_overlays()
 
 	if(mode == SYRINGE_BROKEN)
 		icon_state = "broken"
@@ -246,7 +246,7 @@
 				injoverlay = "draw"
 			if (SYRINGE_INJECT)
 				injoverlay = "inject"
-		overlays += injoverlay
+		add_overlay(injoverlay)
 	icon_state = "[rounded_vol]"
 	item_state = "syringe_[rounded_vol]"
 
@@ -256,7 +256,7 @@
 		filling.icon_state = "syringe[rounded_vol]"
 
 		filling.color = reagents.get_color()
-		overlays += filling
+		add_overlay(filling)
 */
 /obj/item/weapon/reagent_containers/syringe/proc/syringestab(mob/living/carbon/target as mob, mob/living/carbon/user as mob)
 	if(istype(target, /mob/living/carbon/human))