Cmake revamp to be able to compile using libSDL2pp 0.17.0
Cmake revamp to be able to compile using libSDL2pp 0.17.0

Due to the changes made in the CMake from the former project,
the compile step of this tutorial is broken. Made a few
changes to be able to compile it against the latest version of
SDL2pp

libSDL2pp/libSDL2pp-tutorial