Performance chart - league rankings

[tomillie]

When tomillie/HockeyArenaRevampedPublic#36 is completed all data of each game in the season is collected. We can calculate rankings of every team in the league for each round and show it in the graph.

Something similar to https://www.sofascore.com/tournament/football/england/premier-league/17

• but ideally show all teams at once
• with possibility to filter out some teams, or just show the first 5 in that moment
• each team will have one colour assigned, which will never change