Core/Auras: Implement SpellAuraInterruptFlags2::EndOfEncounter

Port From (https://github.com/TrinityCore/TrinityCore/commit/998ee363c5e41141da158ea39c0dae0814967fba)

Source/Game/BattleGrounds/BattleGround.cs

@@ -852,6 +852,8 @@ namespace Game.BattleGrounds
                 player.RemoveAura(BattlegroundConst.SpellMercenaryShapeshift);
                 player.RemovePlayerFlagEx(PlayerFlagsEx.MercenaryMode);
 
+                player.AtEndOfEncounter();
+
                 player.RemoveAurasWithInterruptFlags(SpellAuraInterruptFlags2.LeaveArenaOrBattleground);
 
                 if (!player.IsAlive())                              // resurrect on exit

Source/Game/Entities/Unit/Unit.cs

@@ -591,6 +591,11 @@ namespace Game.Entities
                 Unit.ProcSkillsAndAuras(this, null, new ProcFlagsInit(ProcFlags.EncounterStart), new ProcFlagsInit(), ProcFlagsSpellType.MaskAll, ProcFlagsSpellPhase.None, ProcFlagsHit.None, null, null, null);
         }
 
+        void AtEndOfEncounter()
+        {
+            RemoveAurasWithInterruptFlags(SpellAuraInterruptFlags2.EndOfEncounter);
+        }
+
         public void _RegisterDynObject(DynamicObject dynObj)
         {
             m_dynObj.Add(dynObj);

Source/Game/Maps/Instances/InstanceScript.cs

@@ -372,6 +372,8 @@ namespace Game.Maps
                         case EncounterState.Fail:
                             ResetCombatResurrections();
                             SendEncounterEnd();
+
+                            instance.DoOnPlayers(player => player.AtEndOfEncounter());
                             break;
                         case EncounterState.Done:
                             ResetCombatResurrections();
@@ -382,6 +384,8 @@ namespace Game.Maps
                                 DoUpdateCriteria(CriteriaType.DefeatDungeonEncounter, dungeonEncounter.Id);
                                 SendBossKillCredit(dungeonEncounter.Id);
                             }
+
+                            instance.DoOnPlayers(player => player.AtEndOfEncounter());
                             break;
                         default:
                             break;