Conference Factory URI:

   Set it as Address in account parameters and core in order to easily
   take advantage of address comparison, parameter management and
   compliance with RFC3261

Conference:
  Allow applications to directly mute licrophone and get input device
  volume through the conference object.
  This will ensure that whatever type of confenrece is and regardless if the
  device is hosting or being a participant, the application will have only
  one interface to use and the SDK will work under the hood.

Deprecated methods:
  Delete linphone_core_mute_mic and linphone_core_is_mic_muted
  Add LINPHONE_DEPRECATED to deprecated Account parameter methods

Tester:
  Pass conference factory uri to ClientConference constructor instead of
  focus identity

Memory leaks:
  Free data of list returned by linphone_friend_get_phone_numbers