MazePvP

• Added multiple floors - /mpcreate now has a height option. Bosses can be bound to floors (that is, they never leave that floor) with the mazeLevel property.
• Added maze protection
• Item's nbt values can be stored too, so it's possible to use potions, enchanted swords, etc. To store the nbt value, the item in hand has to be added with /mpadditem

New config properties:

• protectMazes - Whether to prevent maze blocks from being broken by players
• blocks.higherWall - The blocks of the walls on higher levels
• blocks.higherFloor - The blocks of the floors on higher levels
• bosses.bossX.mazeLevel - The floor number (starting from 1) that the boss is bound to. 0 if he's not bound to any floor.