- Add `accounts.<calendar|contact>.accounts.<name>.khal.addresses` option to enable new configuration option, "addresses", from khal, which is used for showing participation status [1]. - Remove mistaken new line in khal implementation, refer to [2]. - Make additions to the existing test case to check the new addresses feature. And remove the empty lines in expected configs. [1]: https://khal.readthedocs.io/en/latest/configure.html#the-calendars-section [2]: https://github.com/nix-community/home-manager/pull/5192#pullrequestreview-1975091763
