[3.3.5] Combat/Threat rewrite - prep & refactor (#19966)

* Combat/Threat rewrite (PR #19930) prep work. Mostly refactors, and a compatibility layer on ThreatManager/HostileReference that allows scripts to be changed already.

src/server/game/Entities/Object/Object.cpp

@@ -1154,7 +1154,7 @@ bool Object::PrintIndexError(uint32 index, bool set) const
 WorldObject::WorldObject(bool isWorldObject) : WorldLocation(), LastUsedScriptID(0),
 m_name(""), m_isActive(false), m_isFarVisible(false), m_isWorldObject(isWorldObject), m_zoneScript(nullptr),
 m_transport(nullptr), m_zoneId(0), m_areaId(0), m_staticFloorZ(VMAP_INVALID_HEIGHT), m_outdoors(true), m_liquidStatus(LIQUID_MAP_NO_WATER),
-m_currMap(nullptr), m_InstanceId(0), _dbPhase(0), m_notifyflags(0), m_executed_notifies(0),
+m_currMap(nullptr), m_InstanceId(0), _dbPhase(0), m_notifyflags(0),
 m_aiAnimKitId(0), m_movementAnimKitId(0), m_meleeAnimKitId(0)
 {
     m_serverSideVisibility.SetValue(SERVERSIDE_VISIBILITY_GHOST, GHOST_VISIBILITY_ALIVE | GHOST_VISIBILITY_GHOST);