oxidize `lstr`

See the [project repository](https://github.com/bgreenwell/lstr) for details.


All features [based on `git.rs`](https://github.com/bgreenwell/lstr/blob/main/src/git.rs).

* [x] status

Note that the `gitignore` functionality comes from the venerable `ignore` crate, which from experience works well enough. The entire traversal is based on it as well.