Implemented SPD into scene module

include/vkcv/Core.hpp

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

modules/material/src/vkcv/material/Material.cpp

modules/scene/CMakeLists.txt

modules/scene/src/vkcv/scene/Scene.cpp

projects/first_scene/src/main.cpp

projects/voxelization/src/main.cpp

src/vkcv/Core.cpp

src/vkcv/ImageManager.cpp

src/vkcv/ImageManager.hpp