Save calculated path

[nicolaibonde]

It would be nice if there was an ability for the user interface to save previously calculated paths.
And of course, the user should be able to open these saved paths and run then with minimal reconfigurations.

Things to have in mind:

• Should it save the user-defined points of a path?
• Should it save the calculated path that is returned from the Backend?
  • If this is the case what happens if the boat is not at the same starting position as when it calculated
    • Should it just naively move straight to the first point in the calculated path?
    • Should it recalculate a path for the beginning and push it to the front of the path?