Display a "ribbon" for flight path (enhancement request)

A ribbon also conveys the roll angle, making the flight path display more informative.
Example from flightcoach.org which also uses color to indicate top/bottom and port/starboard:

Start by locating the existing flight-path display and reviewing the flightcoach.org example linked in the issue. The finished display should use a ribbon rather than the current path representation, convey roll angle, and use color to distinguish top/bottom and port/starboard as described.

Written by the indexing model from the issue text.