RobotViewerGuiPlugin: Extended to allow copying of joint configurations and TCP …

…positions to the clipboard

In the attached file you can see the extended RobotViewerGui on the right side. It is now possible to choose a kinematic chain, the frame and the output type. The output is shown in a preview text box and can be copied to the clipboard using the designated button. The preview will update automatically but this can be disabled using the check box.