And use it to refactor 'rangeIp4'
The `range` attribute is not very useful by itself. However this generator can convert it into a list of all addresses in the given range.
Inspired by this [1] repo, I want to add some functions to `lib.my`. I would have liked to make it work without having to use an overlay, but I did not manage to do it... [1]: https://github.com/hlissner/dotfiles