RenderBeforeWorld/RenderAfterWorld split. still need to sort out which behavior belongs where.

OpenRA.Game/Orders/PlaceBuildingOrderGenerator.cs

@@ -61,11 +61,13 @@ namespace OpenRA.Orders
 				Game.controller.CancelInputMode();
 		}
 
-		public void Render( World world )
+		public void RenderAfterWorld( World world )
 		{
 			world.WorldRenderer.uiOverlay.DrawBuildingGrid( world, Building, BuildingInfo );
 		}
 
+		public void RenderBeforeWorld(World world) { }
+
 		public string GetCursor(World world, int2 xy, MouseInput mi) { return "default"; }
 	}
 }