fixed some issues, included a quick hack

The first three-ish frames of rendering are gray. We fixed this by not recording the first 3 frames and then adding 3 frames to the render.

studio/src/scene.rs

@@ -328,7 +328,8 @@ fn initialiaze_headless(
         },
         CameraControllerBundle::new(focus, camera_xform.translation),
         ScreenCapture::from_out(&headless_settings.output_dir)
-            .with_max_frames(headless_settings.max_frames),
+            //Part of quick hack, see screenshot.rs#261
+            .with_max_frames(headless_settings.max_frames + 3),
     ));
 }