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There is no longer a dummy call to the file_transfer_recv callback at the beginning of a file download.

Don't use 'tester' audio unit in iOS, since linphone is now intelligent enough to not kill the audio unit in between ringing and actual call. This allows tests to run more closely to the real soudncard usage

- Add the LinphoneBuffer object so that file transfer callbacks do not pass out parameters
- Use the LinphoneBuffer object in the file transfer callbacks
- Implement the file_transfer_send callback in the Python file transfer test

Automatically use cores with file-backed sound in the tester for iOS. A lot of tests were missing linphone_core_user_files() calls, so having them automatically set up is easier.

Add an API to keep the accounts created on flexisip across calls to liblinphone_tester_run_tests(). This is used by iOS because of how the XCTest framework works.

Reinitialize log serialization only when all the linphone cores have been destroyed.

Fix linphone_proxy_config_is_server_config_changed() to return weak-equal if the identities are weak-equal but the proxies are equal.

- Add the function linphone_address_equal().
- The comparison of two proxy config addresses now returns one of these three values: equal, weak-equal or different.
- If the new proxy config identity is equal to the previous one, a call to linphone_proxy_config_done() does not
unregister and does not delete the sal op. If it's weak-equal the sal op is destroyed but the unregister is not
done. Finally, if it's different the unregister is performed and the sal op is destroyed.

This reverts commit b61302f9.