[Dead] PvPXP

Fixes an issue where leveling up messages/rewards happen every kill

Adds a command to give players xp: /pvpxp xp add <player> <amount> New 'settings.yml', currently only one option: xp-per-kill, set how much xp a player should get a each kill New way of leveling. Instead of leveling up every 100 xp, now it's you current level * 20. Still won't take long to level up, based on xp per kill. In the /stats menu, you now see how much xp it takes to level up. In the 'commands.yml' you can add to it (if not already there): every-levelup ex. every-levelup: - broadcast %player% leveled up! Fixed a bug where you could kill yourself with a bow for xp.