data(emoji): every emoji, with its CLDR names in English, Korean, and Japanese

emoji.src was a seed of thirty emoji.  cldr2emoji now generates it from
Unicode's emoji-test.txt (Emoji 17.0) and CLDR 48.2.0's annotations: the
1914 fully-qualified emoji without their skin-tone variants, each with
its names and keywords in the three languages, so that a search finds
what fcitx5's emoji picker finds.  The data is under the Unicode License,
added to LICENSES.

LICENSES/README.md

@@ -6,4 +6,8 @@
 - `GPL-2.0-or-later.txt` contains GNU GPL version 2.  The header of
   `map/kanji.dict` grants the option to use GPL version 2 or any later
   version.
+- `Unicode-3.0.txt` contains the Unicode License v3, the terms for the
+  emoji names and keywords in `map/emoji.src` and generated
+  `map/emoji.dict`, derived from Unicode's `emoji-test.txt` and CLDR's
+  annotations.
 No repository-wide license has been declared for original strans source.