plugin XEP-0167, XEP-0353: handle ringing: - add a `jingle_preflight_info` method in the Jingle Application model to handle this kind of information - XEP-0353 is calling `jingle_preflight_info` when a `ringing` message is received - XEP-0167 use this information to send a `ringing` info to frontends

You'll find install instructions in documentation (see doc/installation.rst).

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