Major feat: Hand tracking

[DiddiLeija]

Is your feature request related to a problem? Please describe.

Currently, the HTML version of the game can be opened almost everywhere. However, mobile devices cannot run the game without a keyboard connected. Quoting from the Q&A entry in our wiki, talking about the HTML dist:

Note: For use in Android devices, by now, you must have a keyboard connected (since gameplay requires pressing keys).

Describe the solution you'd like

@HarshNarayanJha and I were discussing a possible fix to this problem: Hand tracking (using some sort of machine learning?).

Since our game is mainly Python, we could combine Pyxel with another tool (we've proposed MediaPipe) to recognize a user's hand in the camera, interpretate commands and replace keys. The idea is based in https://nuitducode.github.io/air-pyxel-demo/ (from a French project I discovered).

There's still a lot of things to discuss and clarify, that's why I opened this GitHub ticket ;)

Describe alternatives you've considered

Keep as is, which would keep the issue.

Adding gamepad keys? See #128.

Additional context

N/A