Changelog:

- fixed a duping glitch (how it worked: go to cancel an item, but stop on the confirmation inventory. Then another player buys that item. After that you cancel the auction and get the item too; same went for partially sold items)
- added the option to auto-collect purchased items - in the config.yml
- the arrows allowed to go to one more empty page if the first page was filled with items; fixed that
- made it possible to open a shulker box also when being in the inventory of your own auctions and int the item view inventory before the confirmation inventory
- when clicking in your inventory with the auction inventory open, the plugin doesn't think anymore that you're pressing the things in the auction
- small tweaks (like not playing a sound when clicking the arrows when the page isn't changed, adding the display-update in ticks to be customizable)