0.5.0 — writing the missing action method

Added

• A quick fix that writes the controller method an action points at, on the
  error that already reports the map leading nowhere. Alt+Enter on the action
  key creates the method, with the name taken from the map rather than typed a
  second time — a second, slightly different spelling produces exactly the 404
  the fix exists to end.

  The docblock keeps what the neighbours agree on and invents nothing else.
  @security is copied, because authentication belongs to the controller rather
  than to one action, and only when every sibling declares the same scheme;
  where they differ, the choice is a decision and the line is left out.
  @response is never borrowed: a template names the body of that answer, and
  copying one would document a response this method does not return — while
  looking entirely deliberate.