Redo the handling of Emoji data

Use the data files from https://github.com/milesj/emojibase.git
as source for our Emoji data. Slightly change our data format by
adding a group to each item, in both the Emoji data and in the
setting for recent-emoji.

Install translated versions of the data as separate resource
bundles in $prefix/gtk-4.0/emoji, and load them when appropriate.

Currently, we have data for de, en, es, fr, zh, with data taken
from Unicode 13 and CLDR 13.

Fixes: #950 #1511

gtk/meson.build

@@ -1027,6 +1027,24 @@ libgtk_dep = declare_dependency(sources: gtk_dep_sources,
                                 link_with: libgtk,
                                 link_args: common_ldflags)
 
+foreach lang : [ 'de', 'fr', 'es', 'zh' ]
+  conf = configuration_data()
+  conf.set('lang', lang)
+  resxml = configure_file(input: 'emoji/gresource.xml.in',
+                          output: lang + '.gresource.xml',
+                          configuration: conf
+  )
+
+  gnome.compile_resources(lang,
+    resxml,
+    source_dir: 'emoji',
+    gresource_bundle: true,
+    install: true,
+    install_dir: join_paths(gtk_datadir, 'gtk-3.0', 'emoji'),
+  )
+endforeach
+
+
 if quartz_enabled
   install_data(['gtk-keys.css.mac'],
                install_dir:  join_paths(get_option('datadir'), 'themes/Mac/gtk-3.0'),