[#96] Moved command stream manager and fixed some warnings

Doxyfile

config/Sources.cmake

include/vkcv/CommandResources.hpp

include/vkcv/Core.hpp

projects/path_tracer/src/main.cpp

src/vkcv/CommandResources.cpp

src/vkcv/CommandStreamManager.cpp

src/vkcv/CommandStreamManager.hpp

src/vkcv/Core.cpp