Implement some simple converters for custom types to/from integers

Given n in 0..51, certainly there exists r, s s.t.  `n = 13s + r`
where r in 0..12 and s in 0..3.  `r` is the rank, and `s` is the suit.

ranks are ordered Ace, 2, 3, ..., Queen, King and suits are ordered
Diamond, Club, Heart, Spade.

Therefore there is a 1-1 correspondence between 0..51 and any card in
the deck.

Jokers are a bit less straightforward; for now I'll define them as an
outlier which doesn't exist in the same bounds (which is why they're
the default return for suit in int->suit).  Likely I'll go for -1
representing a Joker.

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