Implement more complex types of Scoreboard

[KNOXDEV]

A known issue is that the various types of arguments on Scoreboards don't actually do anything currently. Only overall leaderboards will be generated.

The original idea was the following syntax:

/scoreboard add overall
/scoreboard add osint-leaderboard category:OSINT
/scoreboard add small-teams maxteamsize:4
/scoreboard add medium-teams minteamsize:4 maxteamsize:8
/scoreboard add large-teams minteamsize:8
/scoreboard add best-players group:players
/scoreboard del overall

I'm a little hesitant to work on this before we move away from sequelize (#43) since most of that work will have to be redone after the migration, if it happens.