[ChangeLog][QtPositioning] New SatelliteInfo example
added. The example displays the signal strength of surrounding satellites.
The example employs a demo mode on those platforms which don't provide
satellite information

Change-Id: I573266c7a4429c0d2f1bcdfeb01af52ad02efba7
Reviewed-by: Aaron McCarthy <mccarthy.aaron@gmail.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>