@rougier @almarklein are you okay leaving that for a future PR? I figured incremental progress is better than none here. However, I don't want to invest time in making the API changes and implementing tests necessary to have this full functionality (e.g., my system doesn't even have `glutInitDisplayString` -- yay for distribution/system differences!) right now, especially since GLUT is deprecated anyway. I'm fine with reverting the change if that is preferable, but I'd rather work on `glfw` than `glut` ATM...

I've changed the three places `inizialized` was used in the latest commit.