Zigbee polishing

[philipp2310]

• restarting the skill is only stopping but not starting the service
• adding new devices via UI - while it is possible, you will keep the "empty" dummy device => Make the coordinator a real device with "onClick" enabling the registration of a new device
• restarting only Alice without raspi not working smoothly with zigbee
• renaming: open todo for waiting for success => rename in zigbee2mqtt at all?
• onClick with custom payload to show
• onClick for contact: echo time till open
• onClick for env. Sensor: echo temp and humid
• reported telemetry loses it's unit of measurement and is not converted. A Fahrenheit sensor will just be saved like a Celsius without checks or conversions
• Create direct zigbee links between devices (so they work even while the hub is down) -> device to device links?
  ...