Prepending list was only prepend the first element. Fix the behavior to prepend the full list. Add a test and install tester.

Workaround crash with mkv audio/video recording in append mode.

Update ZLIB to 1.2.13 because of vulnerability: "The inflateMark function in inflate.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact via vectors involving left shifts of negative integers. "

Do not pause calls or reject SDP with no active stream if the client is trying to update a conference

A dial out conference will fail to be created if the organizer and the server have no matching codec

Upgrade tunnel revision.

Fix leak of nat_policy_X section in configuration file, and add code to automatically cleanup orphan sections.

Updated liblinphone to add FriendListener allowing to notify a specific friend presence has been updated + fixed/improved a few things related to FriendList & CardDAV

Fix inconsistency in microphone state when a call is started while the microphone is not enabled at LinphoneCore level.

(cherry picked from commit fa0a7bbb)

Restore -Wunused-parameter compilation warning.