Partial implementation of #314 alternative rendering

CMakeLists.txt

applications/gui/src/camera.cpp

applications/gui/src/src_window.cpp

components/codecs/include/ftl/codecs/channels.hpp

components/codecs/src/channels.cpp

components/common/cpp/include/ftl/config.h.in

components/common/cpp/include/ftl/cuda_common.hpp

components/operators/CMakeLists.txt

components/operators/include/ftl/operators/mask_cuda.hpp

components/operators/include/ftl/operators/smoothing.hpp

components/operators/include/ftl/operators/weighting.hpp

components/operators/src/mask.cu

components/operators/src/smoothing.cpp

components/operators/src/weighting.cpp

components/operators/src/weighting.cu

components/operators/src/weighting_cuda.hpp

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

...onents/renderers/cpp/include/ftl/render/render_params.hpp

components/renderers/cpp/src/CUDARender.cpp

components/renderers/cpp/src/dibr.cu