Improves belt item overlay code, Adds new belt item overlay sprites (#17568)

* belt-improvements-and-sprites

* fixes my fix of botany belt allowed contents

code/game/objects/items/weapons/storage/bags.dm

@@ -31,7 +31,7 @@
 	desc = "It's the heavy-duty black polymer kind. Time to take out the trash!"
 	icon = 'icons/obj/janitor.dmi'
 	icon_state = "trashbag"
-
+	belt_icon = "trashbag"
 	w_class = WEIGHT_CLASS_BULKY
 	max_w_class = WEIGHT_CLASS_SMALL
 	slot_flags = null
@@ -75,6 +75,7 @@
 	name = "trash bag of holding"
 	desc = "The latest and greatest in custodial convenience, a trashbag that is capable of holding vast quantities of garbage."
 	icon_state = "bluetrashbag"
+	belt_icon = "trashbag_blue"
 	origin_tech = "materials=4;bluespace=4;engineering=4;plasmatech=3"
 	max_combined_w_class = 60
 	storage_slots = 60

code/game/objects/items/weapons/storage/belt.dm

@@ -15,9 +15,9 @@
 
 /obj/item/storage/belt/update_icon()
 	if(use_item_overlays)
-		overlays.Cut()
+		cut_overlays()
 		for(var/obj/item/I in contents)
-			overlays += "[I.name]"
+			add_overlay("[I.belt_icon]")
 	..()
 
 /obj/item/storage/belt/proc/can_use()
@@ -203,6 +203,7 @@
 		/obj/item/wirecutters,
 		/obj/item/wrench,
 		/obj/item/reagent_containers/spray/weedspray,
+		/obj/item/reagent_containers/spray/plantbgone,
 		/obj/item/reagent_containers/spray/pestspray
 		)
 
@@ -273,7 +274,7 @@
 	storage_slots = 6
 	use_item_overlays = TRUE
 	can_hold = list(
-		"/obj/item/soulstone"
+		/obj/item/soulstone
 		)
 
 /obj/item/storage/belt/soulstone/full/populate_contents()
@@ -290,7 +291,7 @@
 	materials = list(MAT_GOLD=400)
 	storage_slots = TRUE
 	can_hold = list(
-		"/obj/item/clothing/mask/luchador"
+		/obj/item/clothing/mask/luchador
 		)
 
 /obj/item/storage/belt/military
@@ -403,6 +404,7 @@
 		/obj/item/soap,
 		/obj/item/holosign_creator,
 		/obj/item/melee/flyswatter,
+		/obj/item/storage/bag/trash
 		)
 
 /obj/item/storage/belt/janitor/full/populate_contents()

code/game/objects/items/weapons/storage/fancy.dm

@@ -165,6 +165,7 @@
 	icon = 'icons/obj/cigarettes.dmi'
 	icon_state = "cigpacket"
 	item_state = "cigpacket"
+	belt_icon = "patch_pack"
 	w_class = WEIGHT_CLASS_SMALL
 	throwforce = 2
 	slot_flags = SLOT_BELT

code/game/objects/items/weapons/storage/firstaid.dm

@@ -223,6 +223,7 @@
 	icon_state = "pill_canister"
 	icon = 'icons/obj/chemical.dmi'
 	item_state = "contsolid"
+	belt_icon = "pill_bottle"
 	w_class = WEIGHT_CLASS_SMALL
 	can_hold = list(/obj/item/reagent_containers/food/pill)
 	cant_hold = list(/obj/item/reagent_containers/food/pill/patch)
@@ -305,6 +306,7 @@
 	name = "patch pack"
 	desc = "It's a container for storing medical patches."
 	icon_state = "patch_pack"
+	belt_icon = "patch_pack"
 	can_hold = list(/obj/item/reagent_containers/food/pill/patch)
 	cant_hold = list()
 	rapid_intake_message = "flips the lid of the patch pack open and begins rapidly stamping patches on themselves!"