Improved User Interface

[exo-core]

• Cleaned up GUI by using proper Layouts
• Replaced line edits with double spin boxes
• Plugin is now compatible with dark GTK themes
• Displaying current end-effector pose
• Waypoint list can be rearranged
• Arm can be moved to single waypoints
• Using 3-axes marker for waypoints instead of just a single arrow along x-axis (axes colors are currently not displayed correctly due to RVIZ bug #1120)
• Synchronization of waypoint marker pose and input fields in GUI
• renamed member variables according to ROS style guide
• Points can be named now
• Fixed many typos in documentation
• Renamed QT button callbacks so that they do not need to be connected by hand anymore
• Added tooltip texts directly to .ui xml
• Fixed bugs on editing items in tree view
• Not using deprecated MoveIt! MoveGroup interface anymore
• ...