Techweb Fixes (#18121)

* No research announcements

* Fixes and UI updates

* Make power cells empty again :C

* Make sheetsnatchers dump into materials

code/modules/asset_cache/assets/spritesheets/stacks.dm

@@ -1,5 +1,24 @@
-/datum/asset/spritesheet/sheetmaterials
-	name = "sheetmaterials"
+/datum/asset/spritesheet_batched/sheetmaterials
+	name = "sheetmaterials_batched"
 
-/datum/asset/spritesheet/sheetmaterials/create_spritesheets()
-	InsertAll("", 'icons/obj/stacks.dmi')
+/datum/asset/spritesheet_batched/sheetmaterials/create_spritesheets()
+	for(var/obj/item/stack/material/M as anything in subtypesof(/obj/item/stack/material))
+		if(M::default_type in entries)
+			continue
+
+		if(!M::icon_state)
+			continue
+
+		var/append = "_3"
+		if(M::no_variants)
+			append = ""
+		// rods inexplicably have a different format than everything else
+		if(M::icon_state == "rods")
+			append = "-3"
+
+		var/datum/universal_icon/UI = uni_icon(M::icon, "[M::icon_state][append]")
+		if(M.apply_colour)
+			var/datum/material/material = GET_MATERIAL_REF(M::default_type)
+			UI.blend_color(material.icon_colour, ICON_MULTIPLY)
+
+		insert_icon(M::default_type, UI)