Added per-player scoreboards to track overall skill levels
Added config option to disable mcMMO using scoreboards.
Renaming & refactoring to prepare for the rest of the scoreboards.
Start work on global stats scoreboards.
Use a generic scoreboard manager.
Added global scoreboards to track skill rankings
More work on global stats scoreboards.
Don't include child skills yet...
Use chat or scoreboards for /mctop, but not both.

Also optimizes LeaderboardManager.retrieveInfo a good bit.
Make our scoreboards go away after a little while.
Make /mctop scoreboard work for SQL