Implement sorting of highscores

[Edward Hart-Davis]

Sort by and group by name, perhaps search through highscores by criteria if there are a huge amount.

[Riot]

High scores are limited to 10. They are sorted by, predictably enough, the score itself. I don't think cluttering up the otherwise non-interactive high score screen with a myriad buttons for sorting just 10 entries is going to be helpful.

[Riot]

Removing milestone: Beta (automated comment)