GPS status notification for any app, fixes #14. Thx phragment!

Signed-off-by: mvglasow <michael -at- vonglasow.com>
GPS notification refinements (#14)

Show only location from GPS provider
Hide notification when GPS fix is lost
Show number of satellites
Reworked notification icon

Signed-off-by: mvglasow <michael -at- vonglasow.com>