Now we compile everything correctly from catkin and from QtCreator. Had to go back to one CMakeLists.txt file, otherwise would not work

CMakeLists.txt for GUI separated from general file. Now we have two CMakeLists.txt, one for general project, and one for GUI

Added comments to CMakeLists.txt. Thinking now on better solution, maybe having my own CMakeLists.txt inside GUI folder and calling it from this CMakeLists.txt