We had various requests to improve existing OSK layouts, but
haven't accepted them so far as any changes would be overridden
when regenerating the layouts.
However as the upstream layouts at http://www.unicode.org are
extremely slow to update(*), we shouldn't block all improvements.
So instead of letting the update script override all existing
layouts, just make it import new layouts.
(*) not their fault, as the android layouts are a downstream to Google
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1136
The module was imported into the toplevel in !424, but that's at
least a bit weird:
- it's a helper script for one particular aspect (OSK layouts)
- it adds a README.mdwn to our own README.md, and a test/ directory
to our tests/
Move the whole thing to a subdirectory under data/, which is more
appropriate.
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1136
