fix(Core/Creatures): Added new AI function OnTeleportUnreacheablePlayer to teleport all unreachable players. (#12193)

* fix(Core/Creatures): Implemented CREATURE_FLAG_EXTRA_TELEPORT_UNREACHABLE_PLAYERS.

Fixed #11750

* Update.

* Update.

* Update.

src/server/game/AI/CreatureAI.cpp

@@ -306,7 +306,7 @@ bool CreatureAI::_EnterEvadeMode(EvadeReason /*why*/)
     me->SetLootRecipient(nullptr);
     me->ResetPlayerDamageReq();
     me->SetLastDamagedTime(0);
-    me->SetCannotReachTarget(false);
+    me->SetCannotReachTarget();
 
     if (me->IsInEvadeMode())
     {

src/server/game/AI/CreatureAI.h

@@ -88,6 +88,7 @@ public:
         EVADE_REASON_NO_HOSTILES,       // the creature's threat list is empty
         EVADE_REASON_BOUNDARY,          // the creature has moved outside its evade boundary
         EVADE_REASON_SEQUENCE_BREAK,    // this is a boss and the pre-requisite encounters for engaging it are not defeated yet
+        EVADE_REASON_NO_PATH,           // the creature was unable to reach its target for over 5 seconds
         EVADE_REASON_OTHER
     };
 
@@ -210,6 +211,8 @@ public:
 
     virtual void CalculateThreat(Unit* /*hatedUnit*/, float& /*threat*/, SpellInfo const* /*threatSpell*/) { }
 
+    virtual bool OnTeleportUnreacheablePlayer(Player* /*player*/) { return false; }
+
 protected:
     virtual void MoveInLineOfSight(Unit* /*who*/);