- Intercept /give commands.
- Provide an API for giving the player an item and inserting it
into the inventory in the right place(s).
- Change the fill order. We try to fill the current slot first,
the continue to the right to the end of the bar, and then
finally work our way left to the beginning. I think this fill
order should be most comfortable, in terms of having items tend
to fall close to the cursor.
Use interception where possible to modify destintion for items
directly instead of relying on post-hoc inventory rearrangement.
This should resolve the glitches where items appear in the wrong
place in inventory for a flash before being moved.
