Navigate to a point using the Sarsys map

[svenbruun]

The user can select a point in the map and navigate to it using Google Maps. That is usefull where there are roads for waking or cars, but in the terrain it might be more convenient to show the direction and the distance by "luftlinje".
Let the user choose each time between navigate using Google maps or "luftlinje".
In the current version it can be faked by using the distance metering tool, see attached screenshot, but implementing it as a separate function for the user makes it more useful and self explaining.