callmanager: remove unused signals

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

bin/dbus/dbusclient.cpp

bin/jni/callmanager.i

bin/jni/jni_interface.i

bin/nodejs/callback.h

bin/nodejs/callmanager.i

bin/nodejs/nodejs_interface.i

src/client/ring_signal.cpp

src/dring/callmanager_interface.h

src/manager.cpp