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

code/modules/xgm/xgm_gas_mixture.dm

@@ -1,7 +1,7 @@
 /datum/gas_mixture
 	//Associative list of gas moles.
 	//Gases with 0 moles are not tracked and are pruned by update_values()
-	var/list/gas = list()
+	var/list/gas
 	//Temperature in Kelvin of this gas mix.
 	var/temperature = 0
 
@@ -19,6 +19,7 @@
 	volume = _volume
 	temperature = _temperature
 	group_multiplier = _group_multiplier
+	gas = list()
 
 /datum/gas_mixture/proc/get_gas(gasid)
 	if(!gas.len)