Core/WorldStates: Migrate Wintergrasp worldstates to new system

Port From (https://github.com/TrinityCore/TrinityCore/commit/6285033ed5ba8f67330eca40c1ae4840882a98d3)

Source/Game/Entities/Player/Player.PvP.cs

@@ -741,17 +741,6 @@ namespace Game.Entities
         void SendBattlefieldWorldStates()
         {
             // Send misc stuff that needs to be sent on every login, like the battle timers.
-            if (WorldConfig.GetBoolValue(WorldCfg.WintergraspEnable))
-            {
-                BattleField wg = Global.BattleFieldMgr.GetBattlefieldByBattleId(BattlefieldIds.WG);
-                if (wg != null)
-                {
-                    SendUpdateWorldState(WorldStates.BattlefieldWgActive, (uint)(wg.IsWarTime() ? 0 : 1));
-                    uint timer = wg.IsWarTime() ? 0 : (wg.GetTimer() / 1000); // 0 - Time to next battle
-                    SendUpdateWorldState(WorldStates.BattlefieldWgTimeNextBattle, (uint)(GameTime.GetGameTime() + timer));
-                }
-            }
-
             if (WorldConfig.GetBoolValue(WorldCfg.TolbaradEnable))
             {
                 BattleField tb = Global.BattleFieldMgr.GetBattlefieldByBattleId(BattlefieldIds.TB);

Source/Game/Entities/Player/Player.cs

@@ -3466,10 +3466,6 @@ namespace Game.Entities
                         packet.AddState(4882, 0); // WORLD_STATE_HOR_WAVE_COUNT
                     }
                     break;
-                case (uint)AreaId.Wintergrasp: // Wintergrasp
-                    if (battlefield != null && battlefield.GetTypeId() == (uint)BattleFieldTypes.WinterGrasp)
-                        battlefield.FillInitialWorldStates(packet);
-                    break;
                 // Zul Aman
                 case 3805:
                     if (instance != null && mapid == 568)