adding new package rwt_robot_monitor
adding launch file
adding utils
adding less file
adding robot_monitor
#15: update
#15: showing time the monitor received the last diagnostics message
#15: showing -1 if the no message is received
#15: using that instead of this
#15: updating last_diagnostics_update within callback function
#15: removing console.log outputs for debug
#15: implementing constructor of DiagnosticsStatus
#15: implementing Directory system
#15: implementing error list
#15: implementing warn list
#15: implementing modal views
#15: updating view parameters for modal view
#15: implementing collapse-able list
#15: fixing id naming
#15: saving the status of collapses