[MIRROR] Power cell tiers consistency (#28251)

* Power cell tiers consistency (#84074)

## About The Pull Request

Tier 3 had both 20 and 30 MJ cells for some reason, while 10 MJ cell was
considered tier 2.

Now the scaling is proper: 10 MJ is tier 1, 20 MJ is tier 2, and so
on...

Also updated plasma crystal sprite, and gave unique sprites to the
smallest cells.

![image](https://github.com/tgstation/tgstation/assets/3625094/308a88b2-a834-4256-894d-88743311c0b4)

## Why It's Good For The Game

The scaling was off, and the sprites made them look out of place for
their tier.

## Changelog

🆑
fix: Made 10 MJ & 20 MJ cells properly correspond to tiers 1 & 2 in
lathes.
image: Updated cell sprites to correspond to other stock parts of their
tiers.
image: Updated plasma cell, 500KJ cell and 2.5MJ cell sprites
/🆑

* Power cell tiers consistency

* Fix cell

---------

Co-authored-by: Andrew <mt.forspam@gmail.com>
Co-authored-by: SpaceLoveSs13 <68121607+SpaceLoveSs13@users.noreply.github.com>

code/modules/power/cell.dm

@@ -319,19 +319,29 @@
 /obj/item/stock_parts/cell/crap
 	name = "\improper Nanotrasen brand rechargeable AA battery"
 	desc = "You can't top the plasma top." //TOTALLY TRADEMARK INFRINGEMENT
+	icon_state = "aa_cell"
 	maxcharge = STANDARD_CELL_CHARGE * 0.5
 	custom_materials = list(/datum/material/glass=SMALL_MATERIAL_AMOUNT*0.4)
 
+/obj/item/stock_parts/cell/crap/Initialize(mapload)
+	AddElement(/datum/element/update_icon_blocker)
+	return ..()
+
 /obj/item/stock_parts/cell/crap/empty
 	empty = TRUE
 
 /obj/item/stock_parts/cell/upgraded
 	name = "upgraded power cell"
 	desc = "A power cell with a slightly higher capacity than normal!"
+	icon_state = "9v_cell"
 	maxcharge = STANDARD_CELL_CHARGE * 2.5
 	custom_materials = list(/datum/material/glass=SMALL_MATERIAL_AMOUNT*0.5)
 	chargerate = STANDARD_CELL_RATE * 0.5
 
+/obj/item/stock_parts/cell/upgraded/Initialize(mapload)
+	AddElement(/datum/element/update_icon_blocker)
+	return ..()
+
 /obj/item/stock_parts/cell/upgraded/plus
 	name = "upgraded power cell+"
 	desc = "A power cell with an even higher capacity than the base model!"

code/modules/research/designs/power_designs.dm

@@ -24,7 +24,7 @@
 	construction_time = 10 SECONDS
 	build_path = /obj/item/stock_parts/cell/high/empty
 	category = list(
-		RND_CATEGORY_STOCK_PARTS + RND_SUBCATEGORY_STOCK_PARTS_2
+		RND_CATEGORY_STOCK_PARTS + RND_SUBCATEGORY_STOCK_PARTS_1
 	)
 	departmental_flags = DEPARTMENT_BITFLAG_SCIENCE | DEPARTMENT_BITFLAG_ENGINEERING
 
@@ -37,7 +37,7 @@
 	construction_time = 10 SECONDS
 	build_path = /obj/item/stock_parts/cell/super/empty
 	category = list(
-		RND_CATEGORY_STOCK_PARTS + RND_SUBCATEGORY_STOCK_PARTS_3
+		RND_CATEGORY_STOCK_PARTS + RND_SUBCATEGORY_STOCK_PARTS_2
 	)
 	departmental_flags = DEPARTMENT_BITFLAG_SCIENCE | DEPARTMENT_BITFLAG_ENGINEERING