Add HLComparablePair, used to sort playerlists by kills and deaths
TriMap now uses HLComparablePairs and mandates X and Y types be Comparable
Add method to sort TriMap contents by HLComparablePair values
Update Pair and Arena to support recent changes
[Fix] Check for correct permission node when a player tries to join via sign
HLComparablePair's compareTo(...) method no longer returns 0 (see method javadoc)
Add '/oitg leaderboard <arena> [page number]' command
Leaderboard command output no longer sounds idiotic when pageMax == 1
Miscellaneous minute modifications to Arena
Arenas now maintain a leaderboard set to improve efficiency

Populating a leaderboard set is rather costly, so rather than doing so
every time getLeaderboard() is called, each arena has a permanent
leaderboard set which is updated only when the arena's playerData is
altered.