move Mobile et al into Mods/

OpenRA.Game/World.cs

@@ -28,6 +28,8 @@ namespace OpenRA
 		List<IEffect> effects = new List<IEffect>();
 		Queue<Action<World>> frameEndActions = new Queue<Action<World>>();
 
+		public int FrameNumber { get { return orderManager.LocalFrameNumber; } }
+
 		internal readonly OrderManager orderManager;
 		public Session LobbyInfo { get { return orderManager.LobbyInfo; } }
 
@@ -49,7 +51,6 @@ namespace OpenRA
 		}
 
 		public readonly Actor WorldActor;		
-		public readonly PathFinder PathFinder;
 
 		public readonly Map Map;
 		public readonly TileSet TileSet;
@@ -109,8 +110,6 @@ namespace OpenRA
 					if (!p.Stances.ContainsKey(q))
 						p.Stances[q] = Stance.Neutral;		
 			
-			PathFinder = new PathFinder(this);
-			
 			Sound.SoundVolumeModifier = 1.0f;
 			foreach (var wlh in WorldActor.TraitsImplementing<IWorldLoaded>())
 				wlh.WorldLoaded(this);