Begin, the Lag Wars Have (#21839)

<img width="700" height="848" alt="image"
src="https://github.com/user-attachments/assets/e0db50af-35db-43c7-b78e-6c1ea5ac569c"
/>

you take a tiny little two year LOA and this happens
this PR hits some large lag culprits:
- UpdateOverlays() getting spammed by human/update_icon. This was 0.85%
of server CPU time during the event. Doesn't sound like a whole lot but
it's insane. 99% of it was caused by sloppy duplicate calls of
update_icon in set_dir (as well as update icon itself!). Refactored to
stop that
- Makes Follow menu update manually, which cuts down on the 2.8 million
REF() calls it made during the event. This was ~1% of CPU time including
ui_data as well.
- Gets rid of a bunch of random runtimes and some lighting-related
harddels.
- NanoUIs now clean themselves up when their owner qdels rather than
forcing the owner to do REF(src) and close all matching UIs. saves us
~0.1% server cpu time! wowza!

code/modules/vehicles/vehicle.dm

@@ -202,15 +202,13 @@
 	if(powered && cell?.charge < charge_use && !organic)
 		return FALSE
 	on = TRUE
-	set_light_range_power_color(initial(light_range))
-	set_light_on(on)
+	set_light(initial(light_range))
 	update_icon()
 	return TRUE
 
 /obj/vehicle/proc/turn_off()
 	on = FALSE
-	set_light_range_power_color(0)
-	set_light_on(on)
+	set_light(0)
 	update_icon()
 
 /obj/vehicle/emag_act(var/remaining_charges, mob/user as mob)