fedemgp

Results 2 issues of fedemgp

I created a [PR](https://github.com/libSDL2pp/libSDL2pp-tutorial/pull/3) with the changes to be able to compile this examples using the latest version of sdl2pp

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...