Remove mobs/idlenpcpool Initializers, make mob/client expansion happen when maxz is incremented (#34987)

* work

* Seems to worky

* one more place where maxz is touched

code/modules/mapping/reader.dm

@@ -98,7 +98,8 @@ GLOBAL_DATUM_INIT(_preloader, /dmm_suite/preloader, new)
 				if(cropMap)
 					continue
 				else
-					world.maxz = zcrd //create a new z_level if needed
+					while (zcrd > world.maxz) //create a new z_level if needed
+						world.incrementMaxZ()
 				if(!no_changeturf)
 					WARNING("Z-level expansion occurred without no_changeturf set, this may cause problems when /turf/AfterChange is called")
 

code/modules/mapping/space_management/zlevel_manager.dm

@@ -19,7 +19,7 @@
 /datum/controller/subsystem/mapping/proc/add_new_zlevel(name, linkage = SELFLOOPING, traits = list(), z_type = /datum/space_level)
 	var/new_z = z_list.len + 1
 	if (world.maxz < new_z)
-		++world.maxz
+		world.incrementMaxZ()
 		CHECK_TICK
 	// TODO: sleep here if the Z level needs to be cleared
 	var/datum/space_level/S = new z_type(new_z, name, linkage, traits)