Refactors unique_reskin, deletes retool kit (#93775)

## About The Pull Request

Closes #93635

`unique_reskin` is no longer a list on `/item`, now `/datum/atom_skin`

The actual reskinning behavior has been moved out to
`/datum/component/reskinable_item`

PKC reskinning is now handled via alt-click reskin, rather than via the
retooling kit. The retooling kit has been removed.
There's no limit on how many times you can reskin your PKC (though
perhaps we limit it to one reskin and keep the retooling kit as a way to
allow a miner to reskin it a second time?)

The Ashen Skull unique reskin is still a trophy, and instead unlocks its
unique reskin option in the alt-click radial.

## Why It's Good For The Game

I'm unsure why the retooling kit exists on its own, when it's relatively
cheap and just performs the behavior of alt-click reskinning.

So to keep it consistent with all other forms of reskinning I've just
made it baseline. To accomplish that I refactored reskinning.

The new form of reskinning allows for greater potential in adding
reskins, allowing far more than just an icon state change. Also we can
put it on turfs and mobs and structures now which is cool I guess

There's also the added benefit of being able to see an item's reskins
without needing to instantiate it, which the loadout menu uses to great
effect.

## Changelog

🆑 Melbert
refactor: Refactored item reskinning (the alt-click way), report any
oddities with that
del: Deleted the crusher retool kit, now you can just reskin your
crusher with alt-click. The Skull skin is still locked behind having the
Ashen Skull trophy applied.
fix: Stunswords no longer have an incorrect lore blurb
fix: Fixed loadout item reskinning's UI
/🆑

code/modules/reagents/reagent_containers/medigel.dm

@@ -1,3 +1,31 @@
+// Gel skins
+/datum/atom_skin/med_gel
+	abstract_type = /datum/atom_skin/med_gel
+
+/datum/atom_skin/med_gel/blue
+	preview_name = "Blue"
+	new_icon_state = "medigel_blue"
+
+/datum/atom_skin/med_gel/cyan
+	preview_name = "Cyan"
+	new_icon_state = "medigel_cyan"
+
+/datum/atom_skin/med_gel/green
+	preview_name = "Green"
+	new_icon_state = "medigel_green"
+
+/datum/atom_skin/med_gel/red
+	preview_name = "Red"
+	new_icon_state = "medigel_red"
+
+/datum/atom_skin/med_gel/orange
+	preview_name = "Orange"
+	new_icon_state = "medigel_orange"
+
+/datum/atom_skin/med_gel/purple
+	preview_name = "Purple"
+	new_icon_state = "medigel_purple"
+
 /obj/item/reagent_containers/medigel
 	name = "medical gel"
 	desc = "A medical gel applicator bottle, designed for precision application, with an unscrewable cap."
@@ -23,15 +51,11 @@
 	var/apply_method = "spray" //the thick gel is sprayed and then dries into patch like film.
 	var/self_delay = 30
 	custom_price = PAYCHECK_CREW * 2
-	unique_reskin = list(
-		"Blue" = "medigel_blue",
-		"Cyan" = "medigel_cyan",
-		"Green" = "medigel_green",
-		"Red" = "medigel_red",
-		"Orange" = "medigel_orange",
-		"Purple" = "medigel_purple"
-	)
 
+/obj/item/reagent_containers/medigel/Initialize(mapload)
+	. = ..()
+	if(icon_state == "medigel") // oh yeah baby raw icon state check to make sure we can't reskin preset gels
+		AddComponent(/datum/component/reskinable_item, /datum/atom_skin/med_gel)
 
 /obj/item/reagent_containers/medigel/mode_change_message(mob/user)
 	var/squirt_mode = amount_per_transfer_from_this == initial(amount_per_transfer_from_this)
@@ -78,21 +102,18 @@
 	name = "medical gel (libital)"
 	desc = "A medical gel applicator bottle, designed for precision application, with an unscrewable cap. This one contains libital, for treating cuts and bruises. Libital does minor liver damage. Diluted with granibitaluri."
 	icon_state = "brutegel"
-	current_skin = "brutegel"
 	list_reagents = list(/datum/reagent/medicine/c2/libital = 24, /datum/reagent/medicine/granibitaluri = 36)
 
 /obj/item/reagent_containers/medigel/aiuri
 	name = "medical gel (aiuri)"
 	desc = "A medical gel applicator bottle, designed for precision application, with an unscrewable cap. This one contains aiuri, useful for treating burns. Aiuri does minor eye damage. Diluted with granibitaluri."
 	icon_state = "burngel"
-	current_skin = "burngel"
 	list_reagents = list(/datum/reagent/medicine/c2/aiuri = 24, /datum/reagent/medicine/granibitaluri = 36)
 
 /obj/item/reagent_containers/medigel/synthflesh
 	name = "medical gel (synthflesh)"
 	desc = "A medical gel applicator bottle, designed for precision application, with an unscrewable cap. This one contains synthflesh, a slightly toxic medicine capable of healing bruises, burns, and husks."
 	icon_state = "synthgel"
-	current_skin = "synthgel"
 	list_reagents = list(/datum/reagent/medicine/c2/synthflesh = 60)
 	list_reagents_purity = 1
 	amount_per_transfer_from_this = 60
@@ -117,6 +138,5 @@
 	name = "sterilizer gel"
 	desc = "gel bottle loaded with non-toxic sterilizer. Useful in preparation for surgery."
 	icon_state = "medigel_blue"
-	current_skin = "medigel_blue"
 	list_reagents = list(/datum/reagent/space_cleaner/sterilizine = 60)
 	custom_price = PAYCHECK_CREW * 2

code/modules/reagents/reagent_containers/spray.dm

@@ -420,6 +420,23 @@
 	. = ..()
 	icon_state = pick("sprayer_sus_1", "sprayer_sus_2", "sprayer_sus_3", "sprayer_sus_4", "sprayer_sus_5","sprayer_sus_6", "sprayer_sus_7", "sprayer_sus_8")
 
+// Spray bottle skins
+/datum/atom_skin/med_spray
+	abstract_type = /datum/atom_skin/med_spray
+	change_inhand_icon_state = TRUE
+
+/datum/atom_skin/med_spray/red
+	preview_name = "Red"
+	new_icon_state = "sprayer_med_red"
+
+/datum/atom_skin/med_spray/yellow
+	preview_name = "Yellow"
+	new_icon_state = "sprayer_med_yellow"
+
+/datum/atom_skin/med_spray/blue
+	preview_name = "Blue"
+	new_icon_state = "sprayer_med_blue"
+
 /obj/item/reagent_containers/spray/medical
 	name = "medical spray bottle"
 	icon = 'icons/obj/medical/chemical.dmi'
@@ -428,20 +445,10 @@
 	lefthand_file = 'icons/mob/inhands/equipment/medical_lefthand.dmi'
 	righthand_file = 'icons/mob/inhands/equipment/medical_righthand.dmi'
 	volume = 100
-	unique_reskin = list("Red" = "sprayer_med_red",
-						"Yellow" = "sprayer_med_yellow",
-						"Blue" = "sprayer_med_blue")
 
-/obj/item/reagent_containers/spray/medical/reskin_obj(mob/M)
-	..()
-	switch(icon_state)
-		if("sprayer_med_red")
-			inhand_icon_state = "sprayer_med_red"
-		if("sprayer_med_yellow")
-			inhand_icon_state = "sprayer_med_yellow"
-		if("sprayer_med_blue")
-			inhand_icon_state = "sprayer_med_blue"
-	M.update_held_items()
+/obj/item/reagent_containers/spray/medical/Initialize(mapload, vol)
+	. = ..()
+	AddComponent(/datum/component/reskinable_item, /datum/atom_skin/med_spray)
 
 /obj/item/reagent_containers/spray/hercuri
 	name = "medical spray (hercuri)"