[Code Cleanup] Zone Data Loading Refactor (#2388)

* [Code Cleanup] Zone data loading refactor

* Update client_packet.cpp

* strcpy adjustments

* Ensure safe points get reloaded properly

* Simplify GetPEQZone and getZoneShutDownDelay

* Bring in zone_store where needed

* Update client.cpp

* Signature

* Signature

* Convert helpers to using pointers

* PR comment

* Update worlddb.cpp

* Fix loading for instances

* Fix zoning with fallback as well

* Another place for instance fallback

zone/guild_mgr.cpp

@@ -24,7 +24,7 @@
 #include "guild_mgr.h"
 #include "worldserver.h"
 #include "zonedb.h"
-#include "zone_store.h"
+#include "../common/zone_store.h"
 
 ZoneGuildManager guild_mgr;
 GuildBankManager *GuildBanks;