Support for electronics boards (without ethernet)

[dkwach]

Is your feature request related to a problem? Please describe. Lichess.org is supporting electronic games in api. It would be great to have the same functionality in lichobile.

The simplest scenario for these type of devices is to communicate app with electronic board via Bluetooth. In that case device could read and send chess moves via simple protocol/api.

Describe the solution you'd like

• Additional widget/option with possibility of connection to external Bluetooth device.
• Simple protocol for sending and receiving moves e.g. in uci format and initial information(who starts)

Describe alternatives you've considered NA

[vovagorodok]

Implementation moved to branch in forked repo: https://github.com/lichess-org/lichobile/compare/master...vovagorodok:lichobile:bluetooth