Add mypy to Python REPL

I tried to add it to Lint.hs but I can't because mypy needs the target's
external libraries in its environment to load and check the types for that
dependency. So instead, I just added a function to the REPL environment that
runs the type checker. I already had mypy in the REPL environment so I must have
started down this path before and just didn't add the REPL tooling.

The automatic typechecking on load feels like Haskell. A previous version of
this patch had just provided a `typecheck()` function to the REPL, but it felt
awkward to type all that out just to check my code after loading it.

I would like to bind a key like ctrl-r or alt-r to the `reload()` function, but
I'm not sure how to do that. I think Python uses GNU readline so there should be
some docs, but a first pass search didn't find what I needed.

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