Qt Location / Qml Maps: Add support for rotation and compass

It would be nice to add rotation support to the map (http://doc.qt.io/qt-5/qml-qtlocation-map.html) so that the map is rotated with reference to the north pole. Acompanied with this the map should also have a compass indicator which shows the rotation (and set the map to north again if pressed).

Example (Google Maps): http://1.bp.blogspot.com/_7ZYqYi4xigk/TQo-itu-s0I/AAAAAAAAHNg/ymIYJBvpLh4/s1600/image1.png

A possible use case of map rotation is routing where the map is always rotated in such a way that the next driving direction points to the top of the display.