attachMapView
Attach a MapView to the navigation
Return
an Error or null if no error occurred
/!\ For now only one MapView can be attached to the navigation, so if a MapView is already attached it'll be replaced with the new one and the previous one will automatically be detached.
Parameters
mapView
the MapView to attach
verticalVehiclePos
The vertical position of the vehicle symbol (as a percentage of the height of the mapview to apply from screen bottom)