Makes vending machines use spritesheets over artisanal handwritten getflaticon memes (#43914)

About The Pull Request

Pretty much what it says on the tin.

Oh yeah I also removed the string concatenation nonsense in favor of multiline strings and a list.
Why It's Good For The Game

Removes many getFlatIcon calls during the round, also some runtimes from ephemeral items being created and immediately deleted when the vending machines are used.
Changelog

cl Naksu
tweak: vending machines now use spritesheets
/cl

code/modules/client/asset_cache.dm

@@ -663,6 +663,37 @@ GLOBAL_LIST_EMPTY(asset_datums)
 		Insert(initial(D.id), I)
 	return ..()
 
+/datum/asset/spritesheet/vending
+	name = "vending"
+
+/datum/asset/spritesheet/vending/register()
+	for (var/k in GLOB.vending_products)
+		var/atom/item = k
+
+
+		var/icon_file
+		var/icon_state
+		var/icon/I
+
+
+		if (!ispath(item, /atom))
+			continue
+
+		icon_file = initial(item.icon)
+		icon_state = initial(item.icon_state)
+
+		if(icon_state in icon_states(icon_file))
+			I = icon(icon_file, icon_state, SOUTH)
+		else
+			item = new item()
+			I = icon(item.icon, item.icon_state, SOUTH)
+			qdel(item)
+
+		var/imgid = replacetext(replacetext("[item]", "/obj/item/", ""), "/", "-")
+
+		Insert(imgid, I)
+	return ..()
+
 /datum/asset/simple/genetics
 	assets = list(
 		"dna_discovered.png"	= 'html/dna_discovered.png',