Improvement: Update battery related datafields periodically, not only when changed

[Grizzelbee]

Due to the update machanism of the adapter battery scripts fail to detect wether the batteries are empty, because usualy the scripts use the update timestamp of the datapoint to detect the last update and hence if the device may be dead (Last update is older than x hours).

So it would be great if the adapter updates the battery field (Smartlocks.door.state.batteryCritical (indicator.lowbat) )) as long as it receives ANY data from the smartlock.

In addition: If it's possible to get more Information than only lowBat it would be great to get such datapoints.

[r748]

+1
It would really be helpful to have the batteryChargeState value updated periodically in order to be able to rule out an empty battery!