Battlefields: Move BF scripts out of game

Port From (https://github.com/TrinityCore/TrinityCore/commit/49523a74a4c28e5ae17f9a8352aa8224b765b7d8)

Source/Game/Scripting/CoreScripts.cs

@@ -17,6 +17,7 @@
 
 using Framework.Constants;
 using Game.AI;
+using Game.BattleFields;
 using Game.BattleGrounds;
 using Game.Chat;
 using Game.Conditions;
@@ -439,6 +440,18 @@ namespace Game.Scripting
 
         public virtual bool _OnTrigger(Player player, AreaTriggerRecord trigger) { return false; }
     }
+
+    public class BattlefieldScript : ScriptObject
+    {
+        public BattlefieldScript(string name) : base(name)
+        {
+            Global.ScriptMgr.AddScript(this);
+        }
+
+        public override bool IsDatabaseBound() { return true; }
+
+        public virtual BattleField GetBattlefield() { return null; }
+    }
     
     public class BattlegroundScript : ScriptObject
     {
@@ -450,7 +463,7 @@ namespace Game.Scripting
         public override bool IsDatabaseBound() { return true; }
 
         // Should return a fully valid Battlegroundobject for the type ID.
-        public virtual Battleground BattlegroundGetBattleground() { return null; }
+        public virtual Battleground GetBattleground() { return null; }
     }
 
     public class OutdoorPvPScript : ScriptObject

Source/Game/Scripting/ScriptManager.cs

@@ -18,6 +18,7 @@
 using Framework.Constants;
 using Framework.Database;
 using Game.AI;
+using Game.BattleFields;
 using Game.BattleGrounds;
 using Game.Chat;
 using Game.Conditions;
@@ -711,6 +712,12 @@ namespace Game.Scripting
             return RunScriptRet<AreaTriggerScript>(p => entered ? p.OnTrigger(player, trigger) : p.OnExit(player, trigger), Global.ObjectMgr.GetAreaTriggerScriptId(trigger.Id));
         }
 
+        //BattlefieldScript
+        public BattleField CreateBattlefield(uint scriptId)
+        {
+            return RunScriptRet<BattlefieldScript, BattleField>(p => p.GetBattlefield(), scriptId, null);
+        }
+
         //BattlegroundScript
         public Battleground CreateBattleground(BattlegroundTypeId typeId)
         {