Add a hotkey for toggling the path traveling direction: HOME + END + P
Add saving/restoring the reverse flag from JSON.

Also fix a JSON bug with paths, that couldn't actually ever be hit.
(missing path id in method calls, although the id was brought in)
Use pretty formatting when writing the JSON to file.
Add the ability insert points "mid-path"

INSERT + HOME + P: Insert a point before the hilighted point
INSERT + P: Insert a point after the hilighted point