Chess Bot is a bot that allows you to play chess against either another
user or the computer. Use `start with other user` or
`start as <color> with computer` to start a game.
In order to play against a computer, `chess.conf` must be set with the
key `stockfish_location` set to the location of the Stockfish program on
this computer.
Use `bot_handler.storage` to preserve game state across messages.
(@showell also did minor work here to have the test use verify_dialog()
and have the bot respond to empty messages)
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