Display Compass and GPS Status

[CoryFoy]

Is your feature request related to a problem? Please describe.
It's not always clear how strong the compass / GPS is. The Android TAK Tracker shows this information on the screen

Describe the solution you'd like
Pull the Compass / GPS information from LocationManager and display it on the main screen. When a map is not shown, display it like the Android TAK Tracker. When a map is shown, use a compact method of displaying at the bottom