Add a way to see the top players from last month

[BlitzOffline]

Add a way to see how the leaderboards ended last month. Currently VP automatically updates (or rather every 2 minutes) when the month ends so server owners can't see who ended up being the top voters last month. Since VoteParty already has all this data, it would be nice if it displayed it. All it needs is a bit of processing :).

A lot of people have asked for this feature in the discord channel.