Xiaomi-mi-scale

Added
- Added extra logging. Logging Level can be set from config file.
- Deprecated options MISCALE_VERSION, TIME_INTERVAL.
Changed
- Restored HCI Settings

Changed
- Restored MQTT Discovery. ([fixes 65](https://github.com/lolouk44/hassio-addons/issues/65))
- Removed no longer needed MISCALE_VERSION

Changed
- Restoring handling of V1 scales. ([fixes 64](https://github.com/lolouk44/hassio-addons/issues/64))

Changed
- Stopped using deprecated/no longer supported bluepy library and replaced with bleak, requiring major code overhaul. ([fixes 59](https://github.com/lolouk44/hassio-addons/issues/59))
- Updated documentation to reflect MQTT integration (moved out of sensor config)
Breaking Changes
- `/var/run/dbus/:/var/run/dbus/:ro` is needed in docker volumes for bleak to work
- If using a MiScale V1, make sure you add the MISCALE_VERSION to your options.json file (see doc)

Changed
- Changed time format for datestamp to contain timezone ([fixes 59](https://github.com/lolouk44/hassio-addons/issues/59))

Added
- Added support for Long Term Statistics (HA 2021.9 minimum required)
- Impedance posted to MQTT ([fixes 56](https://github.com/lolouk44/hassio-addons/issues/56))