AuctionHousePlugin

Changelog:

• added a setting in the config.yml to enable to choose the amount you want to buy ("partial-selling")
• fixed canceling or deleting an auction by a moderator with /ah admin (Why did nobody notice that it broke 6 updates ago??!)
• admins can expire or delete their own auctions now with /ah admin
• made the cancel button in the item-buy-confirm inventory take the player back to the ah instead of closing their inventory
• pressing cancel instead of confirm when buying an item takes the player back to the ah instead of closing their inventory
• the sorting, search and page are conserved when clicking on an item or going to your own auctions and going back; not reset anymore