Fixed last issues with SPD

include/vkcv/Core.hpp

include/vkcv/DescriptorConfig.hpp

...lgorithm/include/vkcv/algorithm/SinglePassDownsampler.hpp

...es/algorithm/src/vkcv/algorithm/SinglePassDownsampler.cpp

projects/voxelization/src/ShadowMapping.cpp

projects/voxelization/src/ShadowMapping.hpp

projects/voxelization/src/Voxelization.cpp

projects/voxelization/src/Voxelization.hpp

projects/voxelization/src/main.cpp

src/vkcv/Core.cpp

src/vkcv/DescriptorManager.cpp

src/vkcv/ImageManager.cpp

src/vkcv/ImageManager.hpp

src/vkcv/ShaderProgram.cpp