Indicate stale gps reading and outdated weather data in data fields #34
Description
Currently, the headwind indicator will always show the last known headwind direction. If the karoo system indicates that no current bearing is available (bearing is null in location event) or the most recent location is outdated by more than a minute, the indicator should be greyed out to show that the direction may not be up to date.
Similarly, outdated weather data should be indicated.