Function etterna::calculate_player_skillset_rating

pub fn calculate_player_skillset_rating(ssrs: &[f32]) -> f32

Calculate a player’s skillset rating from the individual scores’ skillset ratings

AggregateSSRs in Etterna game code: https://github.com/etternagame/etterna/blob/0b7a28d2371798a8138e78e5789d0014b16b4534/src/Etterna/Singletons/ScoreManager.cpp#L808-L837