Feature Request: Bluetooth Gamepad support

[OHacks]

The ESP32 supports bluetooth.
May be it is possible to add bluetooth gamepad support, that would keep the device as cool as it is and would improve the playability a lot.

[harbaum]

I am afraid Bluetooth (and also WLAN) support will generate frequent background processing load. This may interfere with the pretty tight performance demands of the emulation itself.

Furthermore I have no interest in that feature. My primary goal was a super-trivial-to-use device.

But whoever is interested can of course give this a try.