plugin: exposing plugins to linux ui

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

bin/dbus/dbuspluginmanagerinterface.cpp

bin/dbus/dbuspluginmanagerinterface.h

bin/jni/plugin_manager_interface.i

configure.ac

src/client/plugin_manager_interface.cpp

src/config/yamlparser.cpp

src/config/yamlparser.h

src/dring/plugin_manager_interface.h

src/manager.cpp

src/manager.h

src/plugin/callservicesmanager.h

src/plugin/jamipluginmanager.cpp

src/plugin/jamipluginmanager.h

src/preferences.cpp

src/preferences.h