[Zone] Implement Zone State Saving on Shutdown (#4715)

* Save spawns

* Update base_zone_state_spawns_repository.h

* Zone state save work

* Code cleanup

* More cleanup

* Database migration

* Update database_update_manifest.cpp

* Revert decay at storage model

* Code cleanup

* More cleanup

* More cleanup

* More cleanup

* Entity variables

* Add entity variables to the schema

* Post rebase

* Checkpoint

* Serialize / deserialize buffs

* Current hp / mana / end save / load

* Save / load current_waypoint

* Add zone spawn protection

* Finishing touches

* Cleanup

* Update zone_save_state.cpp

* Cleanup

* Update zone_save_state.cpp

* Update npc.cpp

* Update npc.cpp

* More

* Update perl_npc.cpp

* Update zone_loot.cpp

common/eqemu_logsys.h

@@ -149,6 +149,7 @@ namespace Logs {
 		BotSpellChecks,
 		BotSpellTypeChecks,
 		NpcHandin,
+		ZoneState,
 		MaxCategoryID /* Don't Remove this */
 	};
 
@@ -256,7 +257,8 @@ namespace Logs {
 		"Bot Settings",
 		"Bot Spell Checks",
 		"Bot Spell Type Checks",
-		"NpcHandin"
+		"NpcHandin",
+		"ZoneState"
 	};
 }