How to exchange mission between WimaPlaner and WimaController.

1) convert mission into waypoints
2) send waypoints to WimaController
3) upload desired subset of waypoints to vehicle
4) start/continue mission
5) return vehicle on battery low
6) go to 4) or quit if last waypoint reached


investigate load, loadFromVehicle, syncInProgress, _newMissionItemsAvailableFromVehicle
