Pyleft

Don't crash if there are directories that end in `.py` or `.pyi` in the workspace

Minor documentation fixes and `noqa` comment detection improvements

- BREAKING CHANGE: the `files` input argument has been renamed to `paths`
- Support nested .gitignore files. This should improve performance and prevent some situations where test invalid gitignore files could be loaded and cause a crash
- Ignore invalid gitignore lines and show a warning
- Refactored the settings system so now that any setting can be defined in `pyproject.toml`
- Add new `ignore-if-has-default` option from https://github.com/NathanVaughn/pyleft/issues/91
- Support `.pyi` files

Add support for [pre-commit hooks](https://pre-commit.com)