much better building support; phantom selection is dead AGAIN.

OpenRa.Game/PlaceBuilding.cs

@@ -48,6 +48,8 @@ namespace OpenRa.Game
 		public void PrepareOverlay(int2 xy)
 		{
 			Game.worldRenderer.uiOverlay.SetCurrentOverlay(xy, Name);
-		}
+		}
+
+		public void Tick() { }
 	}
 }