In order to workaround issues with certain PBX, add a property [sip]/pause_before_transfer to request calls to be automatically paused before requesting a transfer.

Fix a crash when a handling CallSession's pendingActions, fix a crash when linphone_core_get_user_agent() is called while Core is in stopped state.

Add a manual test for checking device changed by doing manual OS updates.
It can be run with options `--all --suite "Audio Routes --test "Simple call with real audio devices reload"`
Add 2 tools function to detect volumes on record/playback.
Move usable functions into global headers to avoid future code duplications: check device name and id.
For tester, fix missing entitlements in plist to access microphones.

conference list fails

In fact, at such early stage, the core is still waiting for the
conference list in order to spawn off one HTTP request for every
conference to retrieve its information

Handle the case where a faulty core in a conference sends an SDP with
multiple streams without any label

without the GRUU parameter therefore it must be pruned from the
conference address should it be present

enabled

Make more robust database migration code as the user may set database
paths but instruct the core not to initialize the database. This
behaviour can de achieved by the following lines in the rc file:
[misc]
use_database=1

[storage]
uri=null

By not explicitely disabling friends, call log and chat database, the
SDK assumes that they are enabled and migration sould be carried out

as well as public API linphone_core_create_chat_room_7 functions.
In fact, the conference parameters already have an account member
therefore it is redundant to take the local address in as it might lead
to an unexpected behaviour if not set correctly
Rework me conference parameter member as it is not required anymore as
the address of the me participant is the account identity address

Do not queue a task to dleete a conference if the core is shutting down
Delay by one iteration the Terminated state in the ClientConference
class. In fact, this state transition is done in a state changed
callback, therefore the application may be notified of a state or an
incorrect sequence of them

for basic chatroom. Flexisip based chatroom will set it to the contact
address of the account.
As RFC3428 doesn't allow MESSAGE requests to have a Contact header, the
account contact address is the only way for the server to know which
device sent it.

+ better migration testing

void making the assumption that the first 2 video streams are the main stream the the thumbnail of the local participant

Fix typo

Delete findOneToOneChatRoom from private API
Do not check subject for one to one chats

Add boolean value to know when the addition of a new endpoint has already been notified by the user XML

(cherry picked from commit c26adf04)