Implement silent .ftml data writes on every waypoint change to support tutorial functionality for waypoints

[ReimarBauer]

By accessing the flight track, all waypoint positions are automatically identified on the map. This eliminates the need to manually locate salmon-colored waypoints, as the pointer can be moved directly to the specified coordinates. This functionality allows for the seamless creation, modification, and deletion of waypoints. Changes to the flight track are saved to tutorial_flighttrack.ftml only when tutorial_mode is enabled.