Update submodules
activate rtcp-xr by default
remove warning that produces all the time
fix problem when creating new account on gtk UI. The proxy fields were not initialized with the proxy config default values.
Simplification of TunnelManager class

* TunnelManager does not implement the TunnelClientController anymore
* Methods which are not uses by functions of linphone_tunnel.h have been turn to private
* Private methods which are not used by any other methods have been deleted
* Unused attributes have been deleted
Change naming convention of variables
Change the LinphoneTunnel C API

* The tunnel manager are now thre mode : disable, enable and auto
* Two new functions: linphone_tunnel_set_mode() and linphone_tunnel_get_mode()
* linphone_tunnel_enable(), linphone_tunnel_enabled(), linphone_tunnel_auto_detect()
and linphone_tunnel_auto_detect_enabled() are now deprecated.
Update some Doxygen comments
Update oRTP
Add functions of the new tunnel API to linphonecore_jni.cc
Make the tunnel to listen 'network-reachable' events even if its mode is not 'auto'
Video source reuse API
merge
Merge