conferences: implement methods.
A call can have the "CONFERENCE" type. If it's a conference between 2 peers, the call has "DIALOG" for type. For now, conference replace calls in conversations. When conference chat will be implemented, the conference should be moved in a new conversation. Change-Id: Ia90efc9ebae41698c42a349b0227b0d1450f35c7 Reviewed-by: Guillaume Roguez <firstname.lastname@example.org>
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