Remove old GUI

applications/gui/CMakeLists.txt

applications/gui/src/camera.cpp

applications/gui/src/camera.hpp

applications/gui/src/config_window.cpp

applications/gui/src/config_window.hpp

applications/gui/src/ctrl_window.cpp

applications/gui/src/ctrl_window.hpp

applications/gui/src/frameset_mgr.cpp

applications/gui/src/frameset_mgr.hpp

applications/gui/src/gltexture.cpp

applications/gui/src/gltexture.hpp

applications/gui/src/main.cpp

applications/gui/src/media_panel.cpp

applications/gui/src/media_panel.hpp

applications/gui/src/pose_window.cpp

applications/gui/src/pose_window.hpp

applications/gui/src/record_window.cpp

applications/gui/src/record_window.hpp

applications/gui/src/scene.hpp

applications/gui/src/screen.cpp