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Conflicts:
	mediastreamer2
	oRTP

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.

Callbacks getters still need to be implemented correctly.

pass workdir with environment variable, because passing it from arguments doesn't work if the path has a space.