This was a pain, because apparently we can't refer to
"static_analysis.libcst" as a module before its finished executing, due
to https://bugs.python.org/issue25294. To combat this, I had to change
to direct importing inside parser, which was a bit of a pain due to the
number of nodes used. But, it works.
Go through and clean up where we export things from in the top level
directories. This is the first pass at cleaning up the public API. In
this diff I clean up all top-level exports that were coming out of .py
files and instead export them from libcst's base module itself.
I also didn't export a few of the things defined in newly underscored
files because they were only used internally.
This ports `CSTNode.validate_types_shallow` and
`CSTNode.validate_types_deep`, as well as `libcst._type_enforce` to the
open-source release.
These are useful if someone wants to use LibCST without a static type
checker.
These weren't originally included because `libcst._type_enforce` wasn't
3.7 compatible.
- `pyproject.toml` is supported by isort and black, and lets us call
those tools without supplying a ton of arguments.
- `.editorconfig` is supported by a wide range of editors, and can
automatically set per-project configuration.
- `.pyre_configuration` is used by pyre.
- I added test discovery to the `setup.py` file, which required some
extra `__init__.py` files.
