Nintendoclients

* **Bug fix**: added `nintendo.switch` to setup.py. The whole `nintendo.switch` folder was missing in the previous release.

* **Breaking change:** moved all Switch-related clients into their own namespace. For example, nintendo.dauth is now nintendo.switch.dauth.
* **Breaking change:** dauth client ids are now global constants instead of members of DAuthClient.
* Implemented a client for the sun server (system update metadata).
* Implemented a client for the atumn server (system update content).

* Added support for system version 17.0.0.
* Added default values to RankingOrderParam.offset and RankingOrderParam.count.

Initial release.