Implement SSatoms

* Moves proc/initialize() from being on /atom/movable, /are and /turf/simulated to being on /atom - Now turfs can initialize too
* Added the SSatoms subsystem which controls initialization of atoms at roundstart and during normal conditions.
* Disabled the old auto_init = 0 behavior, ALL atoms should get initialized() called on them now.
* Refactored the way initialize() is called during /New() to utilize SSatoms instead of SScreation
* Removed SScreation, as it was only a stop-gap until SSatoms could be ported.
* Updated the maploader to inform SSatoms when it is loading maps instead of SScreation.
* Updated the template map loader to use SSatoms to perform initTemplateBounds
* Renamed 'initialized' var in seed_storage to deconflict.
* Removed usage of auto_init = 0, replaced with a no-op initialize() proc for atoms that don't need initialization.

code/controllers/master_controller.dm

@@ -59,7 +59,8 @@ datum/controller/game_controller/proc/setup_objects()
 	//Set up spawn points.
 	populate_spawn_points()
 
-	to_world_log("Initializing Floor Decals") // VOREStation Edit
+/*
+	to_world_log("Initializing Floor Decals")
 	admin_notice("<span class='danger'>Initializing Floor Decals</span>", R_DEBUG)
 	var/list/turfs_with_decals = list()
 	for(var/obj/effect/floor_decal/D in world)
@@ -118,3 +119,4 @@ datum/controller/game_controller/proc/setup_objects()
 		if(!QDELETED(lift))
 			lift.initialize()
 			CHECK_SLEEP_MASTER
+	*/