gui adjustments for Colourizer and Overlay

applications/gui2/README.md

applications/gui2/src/frameview.cpp

applications/gui2/src/frameview.hpp

applications/gui2/src/modules/camera.cpp

applications/gui2/src/modules/camera.hpp

applications/gui2/src/modules/thumbnails.cpp

applications/gui2/src/screen.cpp

applications/gui2/src/views/camera.cpp

applications/gui2/src/views/camera.hpp

applications/gui2/src/views/camera3d.cpp

applications/gui2/src/views/config.cpp

components/common/cpp/src/cuda_common.cpp

components/renderers/cpp/src/overlay.cpp