Joystick Icon
I'd like for Phospor to have a joystick icon similar to the Atari joystick, which I find more joyful to see, at least for my purpose.

![image](https://user-images.githubusercontent.com/523169/232706670-56bd3600-a560-414b-9d8f-df1f394e883a.png)

Like this, but with a ball on top, like this one:

![image](https://user-images.githubusercontent.com/523169/232706632-233b278f-8b05-461b-91e4-3b705f92e2de.png)

Thank you for your consideration! And thank you for making these icons free to use. :heart: