Merge branch 'student_GUI' of https://gitlab.ethz.ch/D-FaLL/PandS-System/D-FaLL-System into student_GUI

custom controller a bit more ready, still need to fill information in GUI fields and connect everything to GUI (set setpoint mainly). Landing and take off parameters now in YAML file

added a different link to set the setpoint for GUI, so that PPSClient decides in the end which setpoint to use. Difference between high-level setpoint and low-level setpoint

Added link to use custom controller and safe controller. Need to see what happens if we change yaml file name on the run