Fix segfault when unpacking msgtype option JSON
NH4: Replace database's flavor text with item info

Each item description (unidentified) and item name (identified) gets a
basic description, at least those in vanilla NetHack.  It does not yet
include anything on artifacts or monsters.

For this dev branch specifically, it's also missing:

 * the many new appearances of potions, scrolls, spellbooks and more
 * new items e.g. tinfoil hat, iron safe, new gain foo rings
 * Cthulhu
 * ability to invoke the Amulet of Yendor
 * "irrational pi" for cream pies on Pi Day
 * splitting Tiamat from chromatic dragons
 * randomized dragon names in general

UnNetHack also subtly changes the way many items work, so some of the
entries may even be outright incorrect.

Compared to NetHack4, text has been wrapped to 72 characters (excluding
the omitted leading tab) in order to fit in an 80x24 terminal.  The
British English has been search-and-replaced with American English, and
periods are followed by two spaces for readability.

Replace the database of dubious flavour text with a database of item
spoilers
Alex Smith <ais523@bham.ac.uk>
b9afc36cc58c32317e868694ca1e1414e1b1ea84