Autoloot for Numbered Items

When treasure is generated, a UserGet is called for any dropped number
items, saving the player the hassle of constantly looting. It's a normal
Get attempt, so if the user can't hold the treasure or is too far away,
it will fail.

UserGet does notify the user upon failure due to range, capacity limits, and so on.
Autolooting gives a summary message telling the player whether they tried
to loot all, some, or none of the items from a kill.

This will pick up all numbered items like shillings, reagents, and arrows.

Users can say 'autoloot off' or 'autoloot on' to change their autolooting behavior.
Autoloot is default on.