Mapping previews tool for mapper's mapping needs (#96872)

## About The Pull Request

Makes more machinery using MAP_SWITCHes so their fancy preview icons
could be displayed in SDMM. MAP_SWITCH takes original icon+icon_state of
machinery as first argument and icon+icon_state (basically a machinery
part because the naming system, like `MAP_SWITCH("computer",
"/obj/machinery/computer/slot_machine")` ) from
icons/obj/fluff/map_previews.dmi

Adds a tool (subsystem) for that need that generates preview icons for
stuff that has overlays. To include them in preview generating you have
to set specific variable to TRUE.


## Why It's Good For The Game

Lets us do this instead of black boring consoles: 
(before)
<img width="641" height="575" alt="image"
src="https://github.com/user-attachments/assets/35fc5a19-bc24-4c02-957a-43ddef86e684"
/>
(after)
<img width="641" height="575" alt="image"
src="https://github.com/user-attachments/assets/99310823-747f-4e0a-acf8-60abcc8f2ed1"
/>


## Changelog

🆑
qol: Made machinery with overlays actually be properly displayed in SDMM
editor.
/🆑

code/modules/bitrunning/objects/quantum_console.dm

@@ -2,11 +2,13 @@
 	name = "quantum console"
 
 	circuit = /obj/item/circuitboard/computer/quantum_console
+	icon_state = MAP_SWITCH("computer", "/obj/machinery/computer/quantum_console")
 	icon_keyboard = "mining"
 	icon_screen = "bitrunning"
 	req_access = list(ACCESS_MINING)
 	/// The server this console is connected to.
 	var/datum/weakref/server_ref
+	keyboard_change_icon = FALSE
 
 /obj/machinery/computer/quantum_console/Initialize(mapload, obj/item/circuitboard/circuit)
 	. = ..()