unscorable allowPast is dumb

[clux]

Just mis-scored the match? Now it's considered past. It won't affect anything to rescore it, but there is no difference between this case and an actually dangerous recore.

Implement a default "virtual" that implementations can override with a check if the current match has something in its progression tree (and so is unsafe to rescore). Duel could simply check if right or down is played, ffa could check if next round has any played matches (although this is not a problem in upcoming ffa-tb), groupstage could just return false or have an option for it.

[clux]

Fixed in duel and ffa.