async routes and alisten_to can simplify and avoid shallow copy

[viniarck]

There's opportunity to make routes async and using async event listener to avoid shallow copy. This isn't impacting on this NApp functionality. I won't address this as I'm refactoring routes to minimize changes, but with async it would minimize the number of threads too, so one day we should update routes to be async and use alisten_to for event handlers on this NApp.