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/modules/heavy_vehicle/premade/_premade.dm

@@ -41,6 +41,8 @@
 			head.color = e_color
 	if(!body && e_body)
 		body = new e_body(src)
+		if(body.cell)
+			RegisterSignal(body.cell, COMSIG_CELL_CHARGE, PROC_REF(handle_cell_charge))
 		if(e_color)
 			body.color = e_color
 	if(!arms && e_arms)

code/modules/heavy_vehicle/premade/heavy.dm

@@ -59,6 +59,8 @@
 	has_hardpoints = list(HARDPOINT_BACK)
 	power_use = 500
 
+	cell_type = /obj/item/cell/mecha/nuclear
+
 /obj/item/mech_component/chassis/heavy/prebuild()
 	. = ..()
 	mech_armor = new /obj/item/robot_parts/robot_component/armor/mech/combat(src)

code/modules/heavy_vehicle/premade/light.dm

@@ -76,12 +76,16 @@
 	)
 	. = ..()
 
+/obj/item/mech_component/chassis/light/nuclear
+	cell_type = /obj/item/cell/mecha/nuclear
+
 /mob/living/heavy_vehicle/premade/light/legion
 	name = "legion support exosuit"
 	desc = "A light and agile exosuit painted in the colours of the Tau Ceti Foreign Legion."
 	icon_state = "odysseus"
 
 	e_color = COLOR_TCFL
+	e_body = /obj/item/mech_component/chassis/light/nuclear
 
 	h_head = /obj/item/mecha_equipment/light
 	h_back = /obj/item/mecha_equipment/sleeper
@@ -96,6 +100,7 @@
 	icon_state = "odysseus"
 
 	e_color = COLOR_IAC
+	e_body = /obj/item/mech_component/chassis/light/nuclear
 
 	h_head = /obj/item/mecha_equipment/light
 	h_back = /obj/item/mecha_equipment/sleeper
@@ -109,6 +114,7 @@
 	desc = "A light and nimble exosuit, bearing the colour scheme of the Unathi Kataphracts."
 
 	e_color = COLOR_CHESTNUT
+	e_body = /obj/item/mech_component/chassis/light/nuclear
 
 	h_back = /obj/item/mecha_equipment/quick_enter
 	h_l_hand = /obj/item/mecha_equipment/clamp
@@ -120,8 +126,9 @@
 	desc = "A light and nimble recon exosuit, bearing the colour scheme of the Solarian Armed Forces."
 
 	e_color = COLOR_DARK_GREEN_GRAY
-	e_arms = /obj/item/mech_component/manipulators/combat
 	e_head = /obj/item/mech_component/sensors/combat
+	e_body = /obj/item/mech_component/chassis/light/nuclear
+	e_arms = /obj/item/mech_component/manipulators/combat
 	e_legs = /obj/item/mech_component/propulsion/hover/light
 
 	h_back = /obj/item/mecha_equipment/quick_enter

code/modules/heavy_vehicle/premade/military.dm

@@ -44,10 +44,10 @@
 	mech_health = 3500
 	power_use = 1500
 
+	cell_type = /obj/item/cell/mecha/nuclear
+
 /obj/item/mech_component/chassis/superheavy/prebuild()
 	. = ..()
-	QDEL_NULL(cell)
-	cell = new /obj/item/cell/super(src)
 	mech_armor = new /obj/item/robot_parts/robot_component/armor/mech/combat(src)
 
 /mob/living/heavy_vehicle/premade/superheavy

code/modules/heavy_vehicle/premade/pra.dm

@@ -94,6 +94,8 @@
 	max_damage = 150
 	power_use = 250
 
+	cell_type = /obj/item/cell/mecha/nuclear
+
 /obj/item/mech_component/chassis/pra_egg/armored/prebuild()
 	. = ..()
 	mech_armor = new /obj/item/robot_parts/robot_component/armor/mech/combat(src)