Exosuit Nuclear Power Cores (#18268)

* Added power cores, a type of large battery cell that get used by
exosuits. The nuclear and phoron variants are self-charging.
* Combat mechs now start with nuclear power cores, allowing them to
sustain themselves indefinitely, so long as they stay out of the action
for a bit.
* Removed basic power cells from the mechfab, replaced with the mech
powercores.
* Mech cell statuses now instantly update as soon as the cell charges or
discharges.
* Added a stack of 10 uranium to the machinist's workshop, which can
print two nuclear power cores.

code/game/objects/items/weapons/stunbaton.dm

@@ -70,6 +70,9 @@
 
 /obj/item/melee/baton/attackby(obj/item/attacking_item, mob/user)
 	if(istype(attacking_item, /obj/item/cell))
+		if(attacking_item.w_class != ITEMSIZE_NORMAL)
+			to_chat(user, SPAN_WARNING("\The [attacking_item] is too [attacking_item.w_class < ITEMSIZE_NORMAL ? "small" : "large"] to fit here."))
+			return
 		if(!bcell)
 			user.drop_from_inventory(attacking_item, src)
 			bcell = attacking_item