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
open() in text mode should never be used without an encoding because it defaults
to the locale encoding which is rarely what is wanted.
This fixes the Windows build in some cases (depending on the locale/paths used)
