MySQL Bugfix
```
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IF NOT EXISTS `Slot` INT(1) NULL DEFAULT NULL AFTER `Status`' at line 1
```
And minor code changes
CHANGE: The placeholders are now usable internally in the plugin, even if PlaceholderAPI is not available.
FIX: Playerheads, Base64 Heads are now also available with 1.8 - 1.12
Fixes:
- If there was a function in the GUI that did not exist, then an error occurred in the console and the GUI could not be opened, this was fixed.
- If you changed the slot of the UseItem, the Protection (RemoveItemWhenItIsDisabled) was ignored and you got the item.