Changelog:

- added simple transaction logging [date, buyer, seller, item-name, amount, price, is-BID-auction]
- added [/ah help]
- auction master npc can't be picked up by using the ClickVillagers plugin anymore
- NPCs can't be removed by players who are only in creative mode anymore. You also need the moderator permission to do that.
- to summon a display, the surrounding blocks must now be air
- made the item displays more customizable in messages.yml
- added %price-trim% as a placeholder in the messages.yml file if you want to display "3.2K coins" instead of "3,200 coins"
- fixed an update problem from early versions of the plugin