Humble-v1.2.0

• Re-introduces MoveIt, refer to #52
• Moves demo prefix to front for improved package overview
• Single node for hardware interface
• Static executors where possible
• Adds plenty documentation
• Introduce /lbr, i.e. robot name, namespace to LBRClient for better multi-robot support. Commands / states now e.g. published to /lbr/command / /lbr/state
• Hardware interface exact limits (stand-alone use has safety-limits)
• Gives command guard a node handle