Revert "Merge remote-tracking branch 'upstream/master'"

This reverts commit 135608551f, reversing
changes made to ce7e9ac452.

code/game/objects/structures/holosign.dm

@@ -9,13 +9,11 @@
 	armor = list("melee" = 0, "bullet" = 50, "laser" = 50, "energy" = 50, "bomb" = 0, "bio" = 0, "rad" = 0, "fire" = 20, "acid" = 20)
 	var/obj/item/holosign_creator/projector
 
-/obj/structure/holosign/Initialize(mapload, source_projector)
-	. = ..()
+/obj/structure/holosign/New(loc, source_projector)
 	if(source_projector)
 		projector = source_projector
 		projector.signs += src
-	alpha = 0
-	SSvis_overlays.add_vis_overlay(src, icon, icon_state, ABOVE_MOB_LAYER, plane, dir, add_appearance_flags = RESET_ALPHA) //you see mobs under it, but you hit them like they are above it
+	..()
 
 /obj/structure/holosign/Destroy()
 	if(projector)
@@ -73,8 +71,10 @@
 	desc = "A holographic barrier resembling a firelock. Though it does not prevent solid objects from passing through, gas is kept out."
 	icon_state = "holo_firelock"
 	density = FALSE
+	layer = ABOVE_MOB_LAYER
 	anchored = TRUE
 	CanAtmosPass = ATMOS_PASS_NO
+	layer = ABOVE_MOB_LAYER
 	alpha = 150
 
 /obj/structure/holosign/barrier/atmos/Initialize()
@@ -100,6 +100,7 @@
 	desc = "A holobarrier that uses biometrics to detect human viruses. Denies passing to personnel with easily-detected, malicious viruses. Good for quarantines."
 	icon_state = "holo_medical"
 	alpha = 125 //lazy :)
+	layer = ABOVE_MOB_LAYER
 	var/force_allaccess = FALSE
 	var/buzzcd = 0