Hides the quantity of Key Items, which are usually unique items.
It is possible to switch between two modes for Key Items that are possessed multiple times:
Show the quantity as usual
Give each single instance its own item menu entry.
The changes of the script apply both to the normal menu and to the "Select Key Item..." event command.
Since version 1.1 you can also enter the <unique> notetag into a normal items note field, in order to have it also displayed as if it was a key item (useful for unique weapons and armors for example).