Parity update for Windows version, fixed some controller issues

This is just a quick parity update so the Windows version has the same controller support changes the Linux and Web/HTML version have. The START button on the controller now acts as ENTER for the "Cast of Characters" screen and the B button acts as fire rather than right or left trigger. While right and left trigger are often used for fire, I found they felt a bit too "soft." Also, in the HTML version making B the fire key puts it closer to the rocker controls, making it a bit easier to play. 

The web version is playable, and all versions available at: https://chaslinux.itch.io/sumash