[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

zone/zone.h

@@ -47,6 +47,8 @@
 #include "../common/repositories/lootdrop_entries_repository.h"
 #include "../common/repositories/base_data_repository.h"
 #include "../common/repositories/skill_caps_repository.h"
+#include "../common/repositories/zone_state_spawns_repository.h"
+#include "../common/repositories/spawn2_disabled_repository.h"
 
 struct EXPModifier
 {
@@ -104,7 +106,7 @@ class MobMovementManager;
 class Zone {
 public:
 	static bool Bootup(uint32 iZoneID, uint32 iInstanceID, bool is_static = false);
-	static void Shutdown(bool quiet = false);
+	void Shutdown(bool quiet = false);
 
 	Zone(uint32 in_zoneid, uint32 in_instanceid, const char *in_short_name);
 	~Zone();
@@ -438,6 +440,7 @@ public:
 	// loot
 	void LoadLootTable(const uint32 loottable_id);
 	void LoadLootTables(const std::vector<uint32> in_loottable_ids);
+	void LoadLootDrops(const std::vector<uint32> in_lootdrop_ids);
 	void ClearLootTables();
 	void ReloadLootTables();
 	LoottableRepository::Loottable *GetLootTable(const uint32 loottable_id);
@@ -460,6 +463,14 @@ public:
 	inline void SetZoneServerId(uint32 id) { m_zone_server_id = id; }
 	inline uint32 GetZoneServerId() const { return m_zone_server_id; }
 
+	// zone state
+	bool LoadZoneState(
+		std::unordered_map<uint32, uint32> spawn_times,
+		std::vector<Spawn2DisabledRepository::Spawn2Disabled> disabled_spawns
+	);
+	void SaveZoneState();
+	static void ClearZoneState(uint32 zone_id, uint32 instance_id);
+
 private:
 	bool      allow_mercs;
 	bool      can_bind;