Add AO regen verb (#3601)

code/modules/admin/admin_verbs.dm

@@ -214,7 +214,8 @@ var/list/admin_verbs_debug = list(
 	/client/proc/cmd_display_init_log,
 	/client/proc/cmd_ss_panic,
 	/client/proc/reset_openturf,
-	/datum/admins/proc/capture_map
+	/datum/admins/proc/capture_map,
+	/client/proc/global_ao_regenerate
 	)
 
 var/list/admin_verbs_paranoid_debug = list(

code/modules/ambient_occlusion/ao_verbs.dm

@@ -0,0 +1,22 @@
+/client/proc/global_ao_regenerate()
+	set name = "Regenerate AO (Global)"
+	set desc = "Regenerates AO caches across the map."
+	set category = "Debug"
+
+	if (!check_rights(R_DEBUG)) return
+
+	log_and_message_admins("has triggered a global ambient occlusion rebuild.")
+	usr << "Beginning global AO rebuild."
+
+	SSocclusion.disable()
+
+	for (var/turf/T in world)	// Yes, in world.
+		T.ao_neighbors = null	// To force a recalc.
+		if (T.permit_ao)
+			T.queue_ao()
+
+		CHECK_TICK
+
+	SSocclusion.enable()
+
+	usr << "AO rebuild complete."