Autorank

After your valuable feedback, I've integrated and improved some parts of Autorank to your liking. 

 

Changelog:

- Started working on refactoring Autorank's code. Some parts were a mess and with the help of an excellent reviewer, I'm working on rewriting code. No functionalities will change due to this rewriting.

- All warnings that Autorank finds will be reported to the console after startup and when an OP logs in.

- Fix /ar add and /ar remove commands adding/removing 1 minute too little.

- Improved speed of Location requirement

- Improved Javadoc all around the code base

- Massively improved performance of leaderboard (by 99.95%). Before this update, a server with 60.000 players stored in Autorank's database could take 30 minutes to update the leaderboard. Now, it takes about 1 second. This possible solves leaderboards not showing correctly. 

- Reverted change of leaderboard update: Autorank's leaderboards will be updated every 30 minutes.

- Autorank will now be faster in automatically assigning a path to a player (if possible). This could take 5 minutes before this update.