Added AlteracValley Battleground

Port From (https://github.com/TrinityCore/TrinityCore)

Source/Game/BattleGrounds/BattleGroundManager.cs

@@ -3,15 +3,15 @@
 
 using Framework.Constants;
 using Framework.Database;
-using Game.Arenas;
+using Game.BattleGrounds.Zones;
+using Game.BattleGrounds.Zones.AlteracValley;
+using Game.BattleGrounds.Zones.EyeofStorm;
 using Game.DataStorage;
 using Game.Entities;
 using Game.Networking.Packets;
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using Game.BattleGrounds.Zones;
-using Game.BattleGrounds.Zones.EyeofStorm;
 
 namespace Game.BattleGrounds
 {
@@ -25,7 +25,7 @@ namespace Game.BattleGrounds
         public void DeleteAllBattlegrounds()
         {
             foreach (var data in bgDataStore.Values.ToList())
-                while(!data.m_Battlegrounds.Empty())
+                while (!data.m_Battlegrounds.Empty())
                     data.m_Battlegrounds.First().Value.Dispose();
 
             bgDataStore.Clear();