correctly configure qt for QQuickView
Merge pull request #908 from mavlink/fixquickview

correctly configure qt for QQuickView
Fix race in opmapcontrol
PFD: Avoid copy constructor
Remove unwanted mutex unlocker
Fixed map urls
Merge pull request #910 from mavlink/mapfixes

Mapfixes
Further attempts at improving link stability
Merge branch 'master' of github.com:mavlink/qgroundcontrol
Fix system type update, now correctly hiding airspeed if required
Fix max zoom level to avoid black screen
Merge branch 'master' of github.com:mavlink/qgroundcontrol