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clean network-type in login window, which is not so useful.

Simple backward compatible evolution of the algorithm.
Not registering proxy does not mean disabled: they are the fallback in
case no other proxy matches.

A better description of the proxy config modes would be:
- enabled;
- noregister;
- disabled.
However, it is a bit invasive as many places enable/disable
registrations.

The response code is not exposed to allow mrtp in the future.
There is no possibility to retrieve the code or the sip reason phrase.

This reverts commit f021e9aa.

This reverts commit eab65df8.

Splitted linphone_core_init in half into linphone_core_start, added new global state GlobalConfiguring and a new callback for the configuring state