[#41] Removed unnecessary namespace usage

modules/asset_loader/src/vkcv/asset/asset_loader.cpp

src/vkcv/CommandResources.cpp

src/vkcv/CommandStreamManager.cpp

src/vkcv/Core.cpp

src/vkcv/DescriptorManager.cpp

src/vkcv/ImageManager.cpp

src/vkcv/PipelineManager.cpp

src/vkcv/QueueManager.cpp

src/vkcv/ShaderProgram.cpp

src/vkcv/VertexLayout.cpp