Core/Battlegrounds: Move some areatrigger handling to scripts

Port From (https://github.com/TrinityCore/TrinityCore/commit/9c5b8927f89cda74eb7350801c364b003048ba2b)

Source/Game/BattleGrounds/Zones/ArathiBasin.cs

@@ -208,31 +208,6 @@ namespace Game.BattleGrounds.Zones
             TriggerGameEvent(EventStartBattle);
         }
 
-        public override void HandleAreaTrigger(Player player, uint trigger, bool entered)
-        {
-            switch (trigger)
-            {
-                case 6635: // Horde Start
-                case 6634: // Alliance Start
-                    if (GetStatus() == BattlegroundStatus.WaitJoin && !entered)
-                        TeleportPlayerToExploitLocation(player);
-                    break;
-                case 3948:                                          // Arathi Basin Alliance Exit.
-                case 3949:                                          // Arathi Basin Horde Exit.
-                case 3866:                                          // Stables
-                case 3869:                                          // Gold Mine
-                case 3867:                                          // Farm
-                case 3868:                                          // Lumber Mill
-                case 3870:                                          // Black Smith
-                case 4020:                                          // Unk1
-                case 4021:                                          // Unk2
-                case 4674:                                          // Unk3
-                default:
-                    base.HandleAreaTrigger(player, trigger, entered);
-                    break;
-            }
-        }
-
         void _CreateBanner(byte node, ABNodeStatus type, int teamIndex, bool delay)
         {
             // Just put it into the queue

Source/Game/BattleGrounds/Zones/EyeofStorm.cs

@@ -5,6 +5,7 @@ using Framework.Constants;
 using Game.Entities;
 using Game.Maps;
 using Game.Networking.Packets;
+using System;
 using System.Collections.Generic;
 
 namespace Game.BattleGrounds.Zones.EyeofStorm
@@ -219,6 +220,7 @@ namespace Game.BattleGrounds.Zones.EyeofStorm
             }
         }
 
+        [Obsolete("Remove me when eye of the storm is updated.")]
         public override void HandleAreaTrigger(Player player, uint trigger, bool entered)
         {
             if (!player.IsAlive())                                  //hack code, must be removed later

Source/Game/BattleGrounds/Zones/StrandofAncients.cs

@@ -429,13 +429,6 @@ namespace Game.BattleGrounds.Zones
 
         public override void RemovePlayer(Player player, ObjectGuid guid, Team team) { }
 
-        public override void HandleAreaTrigger(Player source, uint trigger, bool entered)
-        {
-            // this is wrong way to implement these things. On official it done by gameobject spell cast.
-            if (GetStatus() != BattlegroundStatus.InProgress)
-                return;
-        }
-
         void TeleportPlayers()
         {
             foreach (var pair in GetPlayers())

Source/Game/BattleGrounds/Zones/WarsongGluch.cs

@@ -6,6 +6,7 @@ using Game.Entities;
 using Game.Networking.Packets;
 using Game.DataStorage;
 using System.Collections.Generic;
+using System;
 
 namespace Game.BattleGrounds.Zones
 {
@@ -598,6 +599,7 @@ namespace Game.BattleGrounds.Zones
                 UpdateWorldState(WSGWorldStates.FlagCapturesHorde, (int)GetTeamScore(team));
         }
 
+        [Obsolete("Remove me when warsong gluch is updated.")]
         public override void HandleAreaTrigger(Player player, uint trigger, bool entered)
         {
             //uint SpellId = 0;