cherry-pick commits

README

bin/Makefile.am

bin/dbus/cx.ring.Ring.ConfigurationManager.xml

bin/dbus/dbusclient.cpp

bin/dbus/dbusconfigurationmanager.cpp

bin/dbus/dbusconfigurationmanager.h

configure.ac

src/Makefile.am

src/call.cpp

src/client/configurationmanager.cpp

src/client/ring_signal.cpp

src/dring/account_const.h

src/dring/call_const.h

src/dring/configurationmanager_interface.h

src/ice_transport.cpp

src/ice_transport.h

src/manager.cpp

src/manager.h

src/media/video/v4l2/vaapi.cpp

src/media/video/v4l2/vaapi.h