[#24] Initial implementation of a core class.

CMakeLists.txt

Doxyfile

config/Libraries.cmake

config/Sources.cmake

config/ext/CheckLibraries.cmake

include/vkcv/Core.hpp

include/vkcv/Handles.hpp

include/vkcv/Window.hpp

projects/CMakeLists.txt

projects/first_triangle/CMakeLists.txt

projects/first_triangle/src/main.cpp

src/vkcv/Context.cpp

src/vkcv/Context.hpp

src/vkcv/Core.cpp

src/vkcv/CoreManager.cpp

src/vkcv/CoreManager.hpp

src/vkcv/Handles.cpp

src/vkcv/Window.cpp