FreeGameDev

https://github.com/supertuxkart/stk-code/pull/4099
I made a PR recently, and it;'s revamped from an old branch of alayan's.
The difference is, it looks fit in >10 total karts and it's optional. It is defaultly disabled.

I'd like to see a pic with 20/20 shown, as that is where things will feel more cramped. Anyways, having an option is nice, and at least the one picture given seems to look nice.

That's the issue with this PR, the text gets quite small with 10+ karts.

I'm quite neutral on it. I don't need to know how many other karts there are, and I usually know in advance (it usually won't change in a race). The current one gives me all the information I need without anything unnecessary.