[Zone] Zone State Improvements Part 3 (#4773)

* [Zone State] Additional improvements

* Return early

* Update zone_save_state.cpp

* Push

* Push

* Update zone.cpp

* Update zone_save_state.cpp

* Equip items that were dynamically added on restore

* IsZoneStateValid helper

* ZoneStateSpawnsRepository::PurgeInvalidZoneStates

* Add Zone:StateSaveClearDays and PurgeOldZoneStates

* spawn2 / unique_spawn block when restored from zone state

* One time purge

* Update zone_state_spawns_repository.h

* Update npc.cpp

* Update npc.cpp

* test

* ORDER BY spawn2_id

* Stuff

* Restored corpses shouldn't trigger events

* Fix weird edge case

world/world_boot.cpp

@@ -27,6 +27,7 @@
 #include "../common/zone_store.h"
 #include "../common/path_manager.h"
 #include "../common/database/database_update.h"
+#include "../common/repositories/zone_state_spawns_repository.h"
 
 extern ZSList      zoneserver_list;
 extern WorldConfig Config;
@@ -412,6 +413,11 @@ bool WorldBoot::DatabaseLoadRoutines(int argc, char **argv)
 	LogInfo("Cleaning up instance corpses");
 	database.CleanupInstanceCorpses();
 
+	if (RuleB(Zone, StateSavingOnShutdown)) {
+		ZoneStateSpawnsRepository::PurgeInvalidZoneStates(database);
+		ZoneStateSpawnsRepository::PurgeOldZoneStates(database);
+	}
+
 	return true;
 }