New programming course

[tomaszkax86]

Like I said, this project is having some structural problems and starting to contradict itself. Besides, some claim that proposed programming course has spoilers. Doesn't the current one contain spoilers anyway? So what's the difference? I'd say we should still replace the course because the new one is more logical. As for the repo for Colobot 2 assets, this can be simply another branch in existing colobot-data repo.