Add Distance to GCS to Vehicle FactGroup

Plus low battery announce changes

* Map type now set from General settings
* No map type control in maps

This makes text show up better on map images

Added a second polygon. This polygon is updated from the first polygon at each mouse click and is what will ultimately be saved upon completion of drawing.

- Offline maps new set defaults to default map type
- Plan/Fly views use MapScale control

Android done.