Plugwise-smile

- Adjust `dwh` and `setpoint` handling

- Thanks to report from fsaris
- Adept code to allow for change introducted by firmware 4.x

- See [65](https://github.com/plugwise/plugwise-beta/issues/65)
- Add return water temperature from Auxiliary

- Add exception for InvalidAuthentication
- Revert setting heating when None

- Change to `intended_central_heating_state`

- Code improvement for asyncio
- Added firmware 4.x test data and tests
- CI/CD improve pre-commit hooks
- Remove useless water sensor
- Improve testing guidelines README