Managment API not needed anymore

[GrubbyHalo]

Firstly what a well written and nicely documented project.

Secondly, the last time this project was active was 7 years ago. I'm not sure what has changed w.r.t. bluez and its dbus implementation but I am guessing most of the stuff in Mgmt.cpp wasn't there. That's no longer true so although supporting the Management API still works, a lot of those API's can be found in the org.bluez.Adapter1 interface exposed in the /org/bluez/hc0 object