Configuration Menu added

I added the configuration menu.

I still don't know what it featured in the original game. But as I recently added background music and sound effects, I thought it made sense to add two volume sliders.

You can also disable the wind. With wind disabled, the clouds don't move and the trajectory of the cannon ball is also not affected.

By the way, I also changed the music track a little bit in the update. I wasn't too happy with the sound.
Now, it is better I think.