When the craft guide is showing a craft, the output slot is now a button,
which causes the craft guide to show ways in which that output can be
used. This mirrors the way input slots are buttons that show recipes
for the selected ingredient. Usages of an item can be iterated through
in the same way as recipes for the item. This incidentally offers some
ability to retrace one's steps through a crafting chain, without storing
actual history.
Where a recipe specifies an ingredient by group, show a typical group
item pictorially, with a label flag to indicate that it's a group rather
than the single item. This is the inverse of the previous arrangement,
which identified the group by label and dipicted groupiness pictorially.
The new arrangement is easier to interpret, and if the labels are ignored
it actually shows a correct input to the crafting grid.
New system of registration of craft types, recording for each a display
description and the appropriate grid shape. Recipes of a registered type
are shown in the correct grid. Recipes of unregistered craft types are
still displayed as before, using the default 3x3 grid.
Keep the current inventory search string when performing inventory
form actions other than searching. This means the player's input is
not lost if the player breaks off from entering it to switch pages,
or if the player absent-mindedly ends text input with <return>.
