Locked frame times; SAM, GUN, AGUN work again.

- all frames are 40ms long. (except something in the sidebar, which should really be PlayFetchIndex anyway)
    - SAM, GUN, and AGUN no longer crash the game when built. (Turreted used Mobile, which those buildings don't have)

OpenRa.Game/Actor.cs

@@ -128,10 +128,10 @@ namespace OpenRa.Game
 			traits.Add( new Traits.Tree( treeRenderer.GetImage( tree.Image ) ) );
 		}
 
-		public void Tick( Game game, int dt )
+		public void Tick( Game game )
 		{
 			foreach( var tick in traits.WithInterface<Traits.ITick>() )
-				tick.Tick( this, game, dt );
+				tick.Tick( this, game );
 		}
 
 		public float2 CenterLocation;