Add "gettext-domain", "extension-id" (containing the base part of the
UUID) and "gschemabase" (which, combined with "extension-id", gives
the GSettings schema) to metadata.json, autogenerated by the build
system.
It is not used anymore, now that translations are bundled with
the extension. Also, in the zip files it ended up with my home
folder, which is not nice.
This is the stable release, so we support all of GNOME Shell
stable cycle without updates.
(As said earlier, dock and alternate-tab have issues, so they're
not marked 3.2 but just 3.2.0)
