ab976cc2a4
Introduce a new RankingManager that implements a per-round Rank Rating (RR) system (placement + kill-based scoring, placement games, kill caps and RR interpolation). Wire the manager into the plugin (SpeedHG): add field + initialization. Integrate into GameManager: call startRound at game start, registerRoundKill on kills, and onPlayerResult for eliminated players and the winner; adjust some stats calls (addLoss/addWin kept alongside ranking updates). Add corresponding English language messages for placement progress and result notifications.