Port Python 3 backend to Python/C API
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Description

I am working on port Python 3 backend to Python/C API and drop DBus. The idea is allow this backend work in different platforms like Windows and OS X (where there is not DBus).

This task will impact to T6114.

Hi @filipesaraiva
As I see, python backends in this moment works on Python C API (pythonserver.cpp).
So, as I see, this task is duplicate of T6114, isn't it?