Difficulty level management at scoring level

- Function to handle scoring with 3 levels (easy, medium, hard)
- 2 new host variables: minPoints and maxPoints

I saw that you handled to manage Host variables (e.g.
scoreForThisRound) at the function level as well. I tried to replicate
that but had some trouble. So I used only variables at the host level.
Do you think that’s fine?