Have the scan() API return an object of results.

[nkolban]

At present, we are returning a std::vector() from scan(). While this is "ok", we can do better by returning an object that is a container of results ... eg.

BLEScanResults
-> getCount() -> Number of results
-> getResult(i) -> Get the ith result

This would provide a nice encaspulation. However, the most important reason (to me) is that it would elminate the need to expose a piece of std::c++ in an Arduino environment.

[nkolban]

Starting work

[nkolban]

Code changes made and tested.