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/bitrunning/objects/disks.dm

@@ -10,7 +10,6 @@
 	base_icon_state = "datadisk"
 	icon_state = "datadisk0"
 	sticker_icon_state = "o_code"
-	reskin_allowed = FALSE
 	/// Name of the choice made
 	var/choice_made
 
@@ -24,6 +23,9 @@
 		load_callback = CALLBACK(src, PROC_REF(load_onto_avatar)), \
 	)
 
+/obj/item/disk/bitrunning/setup_reskins()
+	return
+
 /obj/item/disk/bitrunning/examine(mob/user)
 	. = ..()
 	. += span_infoplain("This disk must be carried on your person into a netpod to be used.")