This is a clone of a famous game involving a 4x4 grid of random letters.
It uses Plugin's inFilter to filter out private messages to the bot during
the game, so that they are not treated as commands. You can still send
commands to the bot using the command character during this period. When
the game ends, the filter puts things back to normal.
Also implemented a new command when DEBUG is True, wordsolve, which shows
the solution to the current wordgame.
