We don't support any notes yet.
Inside our GameState, we annotate each card with its index in the
original (reverse) deck. In order to support per-card notes, we should
probably share those annotations with the players, and refactor the
player code around them.
I also replaced the callback architecture behind
`PublicInformation.ask_questions()` with a simpler method
`PublicInformation.ask_question()` that gets called repeatedly.
To make all float-based sorts easier, I used the `float-ord` package.
I also used it to clean up some of the sorting in `decide_wrapped()`.
