Core/Battlegrounds: Move to scripts And a lot of misc commits i couldn't recover.

Port From (https://github.com/TrinityCore/TrinityCore/commit/d0d5d309bb5877dc2fcb27f6cb123707a31ec1e8)

Source/Game/Maps/ZoneScript.cs

@@ -9,6 +9,9 @@ namespace Game.Maps
 {
     public class ZoneScript
     {
+        protected EventMap _events = new();
+        protected TaskScheduler _scheduler = new();
+
         public virtual void TriggerGameEvent(uint gameEventId, WorldObject source = null, WorldObject target = null)
         {
             if (source != null)
@@ -48,8 +51,6 @@ namespace Game.Maps
 
         public virtual bool CanCaptureFlag(AreaTrigger areaTrigger, Player player) { return false; }
         public virtual void OnCaptureFlag(AreaTrigger areaTrigger, Player player) { }
-
-        protected EventMap _events = new();
     }
 
     public class ControlZoneHandler