Rework send invitation API: do not give chat room params but a boolean stating whether the chat room should be encrypted or not

  Add ICS cancel/update capability.
  -> Update: participants already invited receive an ICS with the same UID and the sequence incremented by one when the information up to date
  -> Cancel: participants that are no longer part of the conference, receive such ICS

  In order to globally cancel a conference, an admin can send an INVITE to the conference with an empty list of participants

free audio resource before new incoming call, to ensure there is only one write card and avoid crash ios

update belle-sip  to allow multiple challenges in a single authenticate header as defined by rfc2616

See liblinphone!2149

- Fix nuget build with custom paths.
- ORTP: Remove tester winmd for windowstore.

Updated liblinphone to not update chat room last update time stamp when receiving a ConferenceParticipantDeviceStatusChanged event

See liblinphone!2097

Added new core.interpretUrl() method to choose whether or not to apply international prefix to phone number

 Restart video stream when camera changes

bctoolbox: Add auto-named tests macro
liblinphone: Add Call::getRequestAddress()

  Update last notify in the database every time a full state is sent