Bug fix

[p]fixed drop items[/p]
[p]fixed damage zombi vs npc[/p]
[p]the tab key is now available[/p]
[p]It is no longer possible to bind buttons to buttons that are already taken[/p]
[p]better sorting in the item crafting window[/p]
[p]the escape button will close the currently open window (with a few exceptions)[/p]