/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/projectiles/ammunition.dm

@@ -17,8 +17,8 @@
 	var/obj/item/projectile/BB = null	//The loaded bullet - make it so that the projectiles are created only when needed?
 	var/caseless = null					//Caseless ammo deletes its self once the projectile is fired.
 
-/obj/item/ammo_casing/New()
-	..()
+/obj/item/ammo_casing/Initialize()
+	. = ..()
 	if(ispath(projectile_type))
 		BB = new projectile_type(src)
 	randpixel_xy()
@@ -125,8 +125,8 @@
 	var/list/icon_keys = list()		//keys
 	var/list/ammo_states = list()	//values
 
-/obj/item/ammo_magazine/New()
-	..()
+/obj/item/ammo_magazine/Initialize()
+	. = ..()
 	pixel_x = rand(-5, 5)
 	pixel_y = rand(-5, 5)
 	if(multiple_sprites)