- Add ItemL10n struct that is similar to ItemImgs except it holds i18n
description and not items. ItemDesc::l10n uses this struct to provide
common_i18n::Content for both names and descriptions.
So far it only used in voxygen, but it can be used by rtsim in
dialogues.
- Introduced new deprecation, ItemKind::Ingredient, because it uses
item.name().
It's not deleted, because it's used in inventory sorting, and our
inventory sorting is, for some reason, server-side.
- Crafting UI also still uses deprecated item.name(), because again,
sorting. It's probably will be easier to handle, because it's UI
sorting and we can use localized names here, but still, it's a thing
to discuss.
- Moved Item::describe() to voxygen/hud/util.
The most important thing to note is we don't want to completely delete
deprecated .name() and .description() along with corresponding fields
in ItemDef because ItemDef is now "public" API, exposed in plugins and I
don't want to break plugins before we actually implement i18n for them.
Otherwise, it would be basically impossible to use items in plugins.
What's left is actually fully implementing ItemDesc::l10n, create
item_l10n.ron and add fallback on current .name() and .description()
implementation.
