new classes for articulated objects (similar to normal objects)

source/RobotAPI/libraries/ArmarXObjects/CMakeLists.txt

...ArmarXObjects/plugins/ArticulatedObjectProviderPlugin.cpp

...s/ArmarXObjects/plugins/ArticulatedObjectProviderPlugin.h

source/RobotAPI/libraries/armem_objects/CMakeLists.txt

...aries/armem_objects/server/articulated_object/Segment.cpp

...braries/armem_objects/server/articulated_object/Segment.h

...rmem_objects/server/articulated_object/SegmentAdapter.cpp

.../armem_objects/server/articulated_object/SegmentAdapter.h

...ibraries/armem_objects/server/articulated_object/Visu.cpp

.../libraries/armem_objects/server/articulated_object/Visu.h