Visual polish update (v910)

Hello, and thanks for supporting Ducky's Delivery Service!

Today's update (v910) adds a couple of visual polish improvements:

• Ducky's propeller now always rotates clockwise, regardless of which way they are facing
• Turning around looks a bit smoother. There's now one frame of animation when you turn around, instead of instantly snapping to face your new direction (see video below)

These changes are purely visual and don't affect your movement physics, hitboxes, or any other aspect of gameplay. All of your scores, times and speedrun strats are unchanged.

Thanks again for supporting my games, and have fun with Ducky's Delivery Service!