After find phone is stopped, watch sends a `Command` message back
without `system` set, and because of missing hasSystem() check, we'd
wrongly go to condition that sets findPhoneEvent.event to START.
Gadgetbridge can be configured to perform an action when a
Huami device is taken off or the user was detected to fall asleep or
wake up. This functionality was specific to Huami devices, but this
changeset moves this upstream to the AbstractDeviceSupport class in
combination with new GBDeviceEvents.
Now that the ADS has centralized support for this functionality, the
same logic can be used for other devices. In this case, an
implementation is added for supported Xiaomi devices.
Because the reporting of battery state is inconsistent between different
models, the device's battery state was not correctly processed in GB.
For at least the firmware on the Xiaomi Watch S1 Active, the charger
state is broadcast through a separate message from the message
containing the battery level. Even though the battery level was
requested by GB upon receiving this broadcast, the charger state got
discarded as it was expected to also be included in the result of the
subsequent request.
This patch changes the name of the `Charger` message to `DeviceState`
and includes more fields that may be presented by some device models.
Furthemore, the broadcast is cached so that the charger state can be
processed from this cache instead of the battery level response message.
