Vehicle orbit visualization

Implemented vehicle orbit visualization. Whenever a vehicle is in flight, a perfect Kepler orbit is fit to vehicle instant position and velocity relative to the planet it moves close to. Result orbit is displayed altogether with celestial body orbits when appropriate checkbox is checked in the GUI.

Feature demonstration video: https://odysee.com/@ignition:0/005_ignition_vehicle_orbit_visualization:4

If boosted up faster than escape velocity, trajectory type changes from elliptic to hyperbolic: https://odysee.com/@ignition:0/006_ignition_different_orbit_types:d