[MIRROR] Overlay lighting component (#469)

* Overlay lighting component (#52413)

Sparks no longer lag, projectile beams move super smoothly, same with mobs and whatnot. This also allows for easy expansion into directional lights, field-of-view, wee-woo rotating lights or whatever.

It does have a downside: things right-clicked or checked through the alt+click tab will show the light overlay:


This is a BYOND limitation, very well worth it IMO.

🆑
add: Smooth movable lighting system implemented. Projectiles, sparks, thrown flashlights or moving mobs with lights should be much smoother and less laggy.
balance: Light sources no longer stack in range, though they still do in intensity.
/🆑

* Overlay lighting component

Co-authored-by: Rohesie <rohesie@gmail.com>

code/modules/spells/spell_types/lichdom.dm

@@ -81,8 +81,9 @@
 	icon = 'icons/obj/projectiles.dmi'
 	icon_state = "bluespace"
 	color = COLOR_VERY_DARK_LIME_GREEN
+	light_system = MOVABLE_LIGHT
+	light_range = 3
 	light_color = COLOR_VERY_DARK_LIME_GREEN
-	var/lon_range = 3
 	var/resurrections = 0
 	var/datum/mind/mind
 	var/respawn_time = 1800
@@ -97,7 +98,6 @@
 	active_phylacteries++
 	GLOB.poi_list |= src
 	START_PROCESSING(SSobj, src)
-	set_light(lon_range)
 	if(initial(SSticker.mode.round_ends_with_antag_death))
 		SSticker.mode.round_ends_with_antag_death = FALSE