Separate a reusable Image class from Screen (#834)

.gitignore

CHANGELOG.md

CMakeLists.txt

include/ftxui/dom/canvas.hpp

include/ftxui/screen/box.hpp

include/ftxui/screen/image.hpp

include/ftxui/screen/pixel.hpp

include/ftxui/screen/screen.hpp

src/ftxui/dom/canvas.cpp

src/ftxui/screen/box.cpp

src/ftxui/screen/image.cpp

src/ftxui/screen/screen.cpp