Adjusted buffer template to be optional for usage

config/Sources.cmake

include/vkcv/Buffer.hpp

include/vkcv/BufferTypes.hpp

include/vkcv/Context.hpp

include/vkcv/Core.hpp

include/vkcv/DrawcallRecording.hpp

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

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

modules/scene/src/vkcv/scene/MeshPart.cpp

modules/upscaling/include/vkcv/upscaling/FSRUpscaling.hpp

modules/upscaling/include/vkcv/upscaling/NISUpscaling.hpp

modules/upscaling/src/vkcv/upscaling/FSRUpscaling.cpp

modules/upscaling/src/vkcv/upscaling/NISUpscaling.cpp

projects/bindless_textures/src/main.cpp

projects/first_mesh/src/main.cpp

projects/first_triangle/src/main.cpp

projects/head_demo/src/main.cpp

projects/indirect_dispatch/src/AppSetup.cpp

projects/indirect_dispatch/src/MotionBlur.cpp

projects/indirect_draw/src/main.cpp