Players can specify the exact slot they want picked up items to go
into. Items will try to fit into the currently selected slot first
before filling additional slots according to normal rules.
This is experimental and may lead to lost or duplicate items!!
Hopefully this should end up being a lot more intuitive and
immersive than the old sneak-dig hack that only worked for certain
objects. It's consistent across all functionality that causes
items to be added to player invetory (including /give).
Unfortunately it adds yet another globalstep function, and a
fairly complex one at that...
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