DNF gives 0 points instead of position points

[KujawskiSzymon]

This commits add functionality for DNF to always return 0 in case of DNF;

[KujawskiSzymon]

My local repo is a total mess as i have many changes in code; i tried this one on fresh new and it worked, but there is a chance that i missed something;
If this will be approvied im going to add great/normal/bad start PR and then weather changes in 2 parts - Weather insta change (like in og board game instead of forecast weather) with changable/unchangable weather
and in second part slide node fixes for rain in corners

[pjsavola]

I wonder if this should be optional setting or not? I feel like especially weaker AI's will do very poorly in chamionship seasons if you choose multi lap races and they get 0 points for DNF.

[KujawskiSzymon]

I believe DNFing with 0p should not be optional
Indeed weak AI can do poorly in this case but this is a room for improvement for AI, i can look into it further later