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The start of a more comprehensive example for illustrating recursion schemes
By making them operations on the pattern functor instead of the fixed-point, we eliminate some noise. The change to `binop` is a clear win, as it shows that `binop` never cares about the recursive structure. For `filter`, the recursive structure is unavoidable, but the new version is simpler for most cases.
This is the first operation that actually requires `cata`.
Rather than having a case for each function in `Filter`, just have `Binop` and `Unop`, and pass the functions as arguments to those.
This currently uses [Megaparsec](https://github.com/mrkkrp/megaparsec#readme), which isn’t exactly amenable to recursion schemes, but my recursion scheme parsing library isn’t done, and so I might just extract this inline, but ideally I’d finish that up and depend on it.
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The start of a more comprehensive example for illustrating recursion schemes