Implements #325 depth only correspondence

applications/gui/src/camera.cpp

applications/gui/src/src_window.cpp

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

components/operators/CMakeLists.txt

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

components/operators/src/disparity/disp2depth.cu

components/operators/src/fusion/correspondence.cu

components/operators/src/fusion/correspondence_common.hpp

components/operators/src/fusion/correspondence_depth.cu

components/operators/src/fusion/correspondence_util.cu

components/operators/src/fusion/mls_aggr.cu

components/operators/src/fusion/mvmls.cpp

components/operators/src/fusion/mvmls_cuda.hpp

components/operators/src/mask.cpp

components/operators/src/mask.cu

components/operators/src/weighting.cpp

components/operators/src/weighting.cu

components/operators/src/weighting_cuda.hpp

components/renderers/cpp/src/CUDARender.cpp