* Add API docs fragment.
* Improve documentation.
* Move API code to api module_utils.
* Improve docs.
* Add api_facts module.
Does not yet support 'config'. I'm not sure whether that's actually
possible with the API.
* Convert subnet to integer if possible.
* Cleanup.
* Linting and fix tests.
* Remove things that make no sense.
* Simplify code.
* Add basic tests.
* Lint.
