Merge branch 'Ubuntu18.04' into mjcf

CMakeLists.txt

GraspPlanning/examples/GraspPlanner/GraspPlannerWindow.cpp

VirtualRobot/CMakeLists.txt

VirtualRobot/CollisionDetection/CollisionModel.cpp

VirtualRobot/Import/URDF/SimoxURDFFactory.cpp

VirtualRobot/Nodes/RobotNode.cpp

VirtualRobot/RuntimeEnvironment.cpp

VirtualRobot/SceneObject.cpp

VirtualRobot/VirtualRobot.h

...ualization/CoinVisualization/CoinVisualizationFactory.cpp

...Visualization/CoinVisualization/CoinVisualizationNode.cpp

VirtualRobot/Visualization/VisualizationNode.cpp

VirtualRobot/XML/BaseIO.cpp

VirtualRobot/XML/ObjectIO.cpp

VirtualRobot/XML/RobotIO.cpp

VirtualRobot/XML/SceneIO.cpp

VirtualRobot/XML/mujoco/MujocoIO.cpp

VirtualRobot/XML/mujoco/MujocoIO.h

...alRobot/examples/Legacy/ColladaViewer/showRobotWindow.cpp

VirtualRobot/examples/RobotViewer/showRobotWindow.cpp