migrate the rest into Config::

classes/config.php

classes/db.php

classes/digest.php

classes/diskcache.php

classes/feeds.php

classes/logger.php

classes/mailer.php

classes/pref/feeds.php

classes/pref/system.php

classes/pref/users.php

classes/rpc.php

classes/rssutils.php

classes/urlhelper.php

config.php-dist

include/functions.php

include/login_form.php

include/sanity_check.php

index.php

phpstan.neon

plugins/af_proxy_http/init.php