Ports some old TG lighting + opacity refactors (#29724)

* lighting ports

* missed these

* fix

* tweak optical scanners

* Update code/datums/elements/light_blocking.dm

Co-authored-by: Contrabang <91113370+Contrabang@users.noreply.github.com>
Signed-off-by: kyunkyunkyun <120701975+kyunkyunkyun@users.noreply.github.com>

---------

Signed-off-by: Burzah <116982774+Burzah@users.noreply.github.com>
Signed-off-by: kyunkyunkyun <120701975+kyunkyunkyun@users.noreply.github.com>
Co-authored-by: Burzah <116982774+Burzah@users.noreply.github.com>
Co-authored-by: Contrabang <91113370+Contrabang@users.noreply.github.com>

code/game/objects/structures/aliens.dm

@@ -102,7 +102,6 @@
 */
 /obj/structure/alien/resin/door
 	name = "resin door"
-
 	icon = 'icons/obj/smooth_structures/alien/resin_door.dmi'
 	icon_state = "resin"
 	base_icon_state = "resin"
@@ -187,7 +186,7 @@
 		playsound(loc, close_sound, 50, 1)
 		flick("[initial_state]closing", src)
 	density = !density
-	opacity = !opacity
+	set_opacity(!opacity)
 	state_open = !state_open
 	addtimer(CALLBACK(src, PROC_REF(operate_update), bumped_open), 1 SECONDS)
 

code/game/objects/structures/curtains.dm

@@ -135,7 +135,7 @@
 /obj/structure/curtain/update_overlays()
 	. = ..()
 	if(!assembled)
-		opacity = FALSE
+		set_opacity(FALSE)
 		return
 
 	if(opacity)

code/game/objects/structures/flora.dm

@@ -433,7 +433,7 @@
 	. = ..()
 	if(icon_state == "random-alien")
 		icon_state = "alien-[rand(1,8)]"
-	
+
 /obj/item/kirbyplants/large/alien/alien1
 	icon_state = "alien-1"
 /obj/item/kirbyplants/large/alien/alien3
@@ -519,7 +519,7 @@
 /obj/structure/bush/Initialize(mapload)
 	. = ..()
 	if(prob(20))
-		opacity = TRUE
+		set_opacity(TRUE)
 
 /*
 /obj/structure/bush/Bumped(M as mob)

code/game/objects/structures/mineral_doors.dm

@@ -101,7 +101,7 @@
 
 /obj/structure/mineral_door/proc/operate_update()
 	density = !density
-	opacity = !opacity
+	set_opacity(!opacity)
 	state_open = !state_open
 	recalculate_atmos_connectivity()
 	update_icon(UPDATE_ICON_STATE)