This whole textdomain is dedicated to localized strings revolving around the
game's AI engine and the AI demos/test scenarios, with around 370 strings in
it.
Other than a few strings near the start of the catalogue template, none of these
have any value for regular players since they are sourced from AI demos and
test scenarios in data/ai/micro_ais/ and data/ai/scenarios/. None of them will
be displayed to people who aren't tinkering with WML or contributing to AI
development as part of the Wesnoth dev team, and some of the language used in
them is very technical in nature.
This commit leaves the "#textdomain wesnoth-ai" lines in the AI demos, but
drops the .po and .pot catalogues for wesnoth-ai. The few strings that are
seen by regular players move to the wesnoth-lib textdomain.
This reverts commit 1d84d83c6c.
I had introduced use of the hidden= key in b2df837d8e, but
apparently didn't add them to the valid list of non-aspect keys.
As indicated in the comment of the idle_ai config file, an AI needs to
contain at least one stage, otherwise the default AI will be injected
under certain circumstances. Unlike indicated in the comment, this now
also applies to loading a mid-scenario save. (I will add that to the
comment in the next commit.)
As this AI was in data/ai/dev/, it was previously only loaded when
Wesnoth was started in debug mode. The config was thus not available
when playing in no-debug mode, causing the default AI to be injected on
reload. This caused issue #1955.
While not strictly necessary, we keep a redirect in data/ai/dev for
backward compatibility, in case the file is included in add-ons.
