/atom New() => Initialize() [MDB IGNORE] (#8298)

* Find and replace argless atom New() to Initialize().

* Manual replacement of no-arg New() to Initialize().

* Manually replacing remaining New() overrides.

* Fixing linter issues with now-removed New() args.

* Tidying area init overrides.

* Porting Neb's atom subsystem.

* Trying to isolate init problems.

* Adjusting Init code post-test.

* Merging duplicate Initialize() procs.

* Merge resolution.

code/modules/shieldgen/shield_diffuser.dm

@@ -13,8 +13,8 @@
 	var/alarm = 0
 	var/enabled = 1
 
-/obj/machinery/shield_diffuser/New()
-	..()
+/obj/machinery/shield_diffuser/Initialize()
+	. = ..()
 	var/turf/T = get_turf(src)
 	hide(!T.is_plating())