Add zapper support

Should be possible with third party zappers using patched games: https://neslcdmod.com/

See discussion [https://github.com/fhoedemakers/pico-infonesPlus/discussions/69](https://github.com/fhoedemakers/pico-infonesPlus/discussions/69)

Code in the [zapper branch](https://github.com/fhoedemakers/pico-infonesPlus/tree/zapper)