Resolves #336 Flipped VR images

applications/gui/src/camera.cpp

applications/gui/src/screen.cpp

applications/gui/src/src_window.cpp

components/renderers/cpp/include/ftl/cuda/transform.hpp

components/renderers/cpp/src/CUDARender.cpp

components/renderers/cpp/src/colour_util.cu

components/renderers/cpp/src/dibr.cu

components/renderers/cpp/src/overlay.cpp

components/renderers/cpp/src/splatter_cuda.hpp