use lower-level DBus library

[nullobsi]

sdbus-cpp is great but requires hacks for the proxy objects which increases code complexity

also, it requires a lot of spreading of the code state. moving to a lower level library would allow some state from dbus (request path)

[Thaodan]

Is there a C++/DBUS Library besides QtDBus? Using sdbus as a backend sounds like it makes sense the only way to go lower is to use the sdbus C API.