any contest stat sum above 73 can have any sheen if you really give it trash blocks, lol
not trying to bruteforce the exact combination of consumed blocks/poffins, so these clamps may permit impossible intermediate values, but these are infrequent and meh.
Closes#3325
Can't lower contest stats, but there's no cases of them giving a pkm with contest stats in a game that can't obtain contest stats -- let's just reset instead of zero for futureproofing.
Make them extension methods too; add an overload if you want to purposefully maximize them.