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Fixed issue where 488 IMDN is received with wrong MessageID when recipient can't decrypt a chat message

Fix issues with conference implementation, where participant are not connected or disconnected as they should when they have already their streams in Running state.

- remove callbacks of shared core when core stops
- post onNetworkChanges callback with doLater instead of dispatch async

Store chat message in database before auto download + fixed chat message sent callback notified before file upload finished and message was actually sent

Fix an issue where incoming SIP MESSAGEs request received part of a dialog are always dropped starting from the second one, because they of course share the same call-id, which is used to identify duplicates.

(cherry picked from commit 7bdd070f)

- Add Shared Core logic in shared-core-helpers and constructors in factory
- Add high level functions to get the message or the new chat room from a push notification
- Allow wrappers to use linphone logger
- Add core option to send imdn without being registered
- Improve linphone_core_stop()
- Move the paths functions to the same place for all platforms and add paths for iOS shared file system
- Add shared core tests and modify LinphoneCoreManager to create shared cores

The connection status of the tunnel shall be consistent with the moment where liblinphone processes the event raised by the TunnelClient thread.
With the previous logic, it could say that tunnel is connected as soon as the TunnelClient thread has connected, but not liblinphone has not yet taken the actions so that RTP packets from future calls go through the tunnel.
This creates race conditions in applications where a call isn't going through the tunnel.

- RTT text stream being the only one accepted in a session
- conformance of target video output bitrate to b=AS specifiers in a received SDP.

MStream can be deleted when calling getAvpfRrInterval on end call report

Fix an issue where, because the audio stream was RTP/AVP and the video stream was RTP/AVPF, the full session was rejected.
To solve this, the CallParams::hasAvpf() method algorithm is changed. It will return true if at least the video stream has avpf, or if all streams have avpf.

Check for the presence of supported header in call-op
Change a test to add a case where the Supported header doesn't exists

Fix MainDb tester: it was creating tests accounts for nothing, which takes time and randomize the performance measurements made on the chatroom db loading.

Handle network connectivity monitoring independently for IPv4 and IPv6. Indeed, the previous code could not work if the host has no IPv6 support at all.

Set core cbs as internal object to avoid legacy java wrapper to make any confusion 

Use liblinphone and liblinphone++ for other