api: remove unused importAccounts exportAccounts

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

bin/dbus/dbusconfigurationmanager.cpp

bin/dbus/dbusconfigurationmanager.h

bin/jni/configurationmanager.i

bin/nodejs/configurationmanager.i

src/archiver.cpp

src/archiver.h

src/client/configurationmanager.cpp

src/dring/configurationmanager_interface.h