More macros (#2955)

changes:

Holomaps now use an area flag instead of a proc to determine which areas do not draw on the holomap.
The supply shuttle once more has a roof.
The supply shuttle's landing zone is now dynamically lit.
Turfs only generate visibility updates on Initialize() after mapload - visualnet is not initialized by then anyways.
Merged /datum/gas_mixture/(init) into /datum/gas_mixture/New().
Converted a ZAS proc into a macro.
Made ZAS attempt to remove a turf from a zone instead of always rebuilding it in a certain case.
Macroized two misc procs.
Fixes #2947.

code/modules/mob/freelook/update_triggers.dm

@@ -16,11 +16,6 @@
 	updateVisibility(src)
 	return ..()
 
-/turf/simulated/Initialize()
-	. = ..()
-	updateVisibility(src)
-
-
 // STRUCTURES
 
 /obj/structure/Destroy()
@@ -33,8 +28,8 @@
 	updateVisibility(src)
 	return ..()
 
-/obj/effect/New()
-	..()
+/obj/effect/Initialize()
+	. = ..()
 	updateVisibility(src)
 
 // DOORS