Add Auction-House-NG

Talked with russ about this over drinks; probably should be more akin to a "woot" store, where the DM picks an item to sell, and it keeps selling till someone buys it, rather than the old system where users put up their own stuff for auction (note: that system never worked, and had more than a few flaws in how it could even be implemented in game)

The issue names no files, tests, or entry points; begin by reviewing the existing auction system in this C NetHack fork and the referenced bingehack4 project. Clarify the intended “woot” behavior and implementation scope before starting; done requires an agreed specification and a working replacement for the old user-submitted auction model.

Written by the indexing model from the issue text.