sortloot - enhanced sorting [re-revamp anyone?]

sortloot - enhanced sorting [re-revamp anyone?]

When objects are in the same class, sortloot orders them by their
formatted name.  It was reformatting each object every time it got
compared to another object.  Change that to remember the formatted
name so that any given object is formatted at most once (during the
current sort; future sorts will need to format it again).

Armor and weapon classes are subdivided into smaller subclasses
and the formatting plus alpha compare is only done for items in
the same subclass, so helms come out before cloaks and don't get
their names compared, for instance.  [That was from my 'revamp'
rather than the original implementation.]  This adds a couple more
subclass sets:  food (named fruit, 'other' food, tins, eggs, corpses,
globs) and tools (containers, pseudo-containers [bag of tricks and
horn of plenty once those have become discovered; prior to discovery,
bag of tricks is classified as a container and horn of plenty as an
instrument], instruments, 'other' tools).

The main difference, aside from the formatting efficiency improvement,
is to change the previous sort order
| pink potion
| potion of enlightenment
| purple-red potion
to be
| pink potion
| purple-red potion
| potion of enlightenment
by grouping undiscovered items before discovered items when class and
subclass match.  So discovery state is essentially a sub-subclass and
formatting plus string comparison is only done for members of the
same sub-subclass.  There are actually four state values:  unseen
(which applies to particular objects rather than to their type),
unknown (not discovered and not named), named (not discovered but has
player-assigned type name), and discovered (either fully discovered
or considered not interesting to discover [no alternate description,
not nameable]).

My testing was primarily done with pickup ('m,' with menustyle:T)
and sortloot:Loot (the default) plus !sortpack (not the default and
not a setting I ordinarily use, but less verbose without the class
separators).  It won't astonish me if oddities crop up with other
usage combinations.