GitLab

Also add compiler depecation tag on functions that are marked as
deperecated in their documentation.

* generate the wrapper implementation in a single file
* the CMakeLists.txt file that build the wrapper is now static

There is now only one LinphoneCoreCbs instance attached to the core
that is in charge to collect all events for the C++ wrapper layer.
Thus, it is the concern of the C++ wrapper to dispach events to all
the C++ listeners.