Extends atom_reskin to be more modular/adds support for greyscale reskins in the loadout menu (#94466)

Co-authored-by: SmArtKar <44720187+SmArtKar@users.noreply.github.com>

code/modules/paperwork/clipboard.dm

@@ -51,6 +51,8 @@
 /obj/item/clipboard/Initialize(mapload)
 	update_appearance()
 	. = ..()
+
+/obj/item/clipboard/setup_reskins()
 	AddComponent(/datum/component/reskinable_item, /datum/atom_skin/clipboard)
 
 /obj/item/clipboard/Destroy()

code/modules/paperwork/pen.dm

@@ -185,11 +185,12 @@
 /datum/atom_skin/cap_pen
 	abstract_type = /datum/atom_skin/cap_pen
 
-/datum/atom_skin/cap_pen/apply(atom/apply_to)
+/datum/atom_skin/cap_pen/apply(atom/apply_to, mob/user)
 	. = ..()
 	apply_to.desc = "It's an expensive [preview_name] fountain pen. The nib is quite sharp."
+	apply_to.update_desc()
 
-/datum/atom_skin/cap_pen/clear_skin(atom/clear_from)
+/datum/atom_skin/cap_pen/clear_skin(atom/clear_from, mob/user)
 	. = ..()
 	clear_from.desc = initial(clear_from.desc)
 
@@ -244,10 +245,12 @@
 		speed = 20 SECONDS, \
 		effectiveness = 115, \
 	)
-	AddComponent(/datum/component/reskinable_item, /datum/atom_skin/cap_pen)
 	//the pen is mightier than the sword
 	RegisterSignal(src, COMSIG_DART_INSERT_PARENT_RESKINNED, PROC_REF(reskin_dart_insert))
 
+/obj/item/pen/fountain/captain/setup_reskins()
+	AddComponent(/datum/component/reskinable_item, /datum/atom_skin/cap_pen)
+
 /obj/item/pen/fountain/captain/proc/reskin_dart_insert(datum/component/dart_insert/insert_comp, skin)
 	SIGNAL_HANDLER
 	if(!istype(insert_comp)) //You really shouldn't be sending this signal from anything other than a dart_insert component