extract demos, fix nng dependency

.gitmodules

CMakeLists.txt

lib/nng

package.xml

src/connection/MqttConnection.cpp

src/connection/NngConnection.cpp

src/controller/Controller.cpp

src/controller/DummyRobotArmController.cpp

src/controller/MoveItRobotArmController.cpp

src/controller/RobotArmController.cpp

src/dummies/dummy_cgv.cpp

src/dummies/dummy_pick_place.cpp

src/dummy_cgv_controller.cpp

src/dummy_rag_controller_a.cpp

src/dummy_rag_controller_b.cpp

src/moveit_cgv_controller.cpp

src/util/scene_collision_object.cpp

src/util/scene_constructor_util.cpp

src/util/scene_controller_node.cpp