create_unique_id() was changed to use UUIDs instead of a counter in the last commit. Since now it depends on connection_create_uuid() which is in the xmpp subfolder the function should also be moved there. Renamed it to connection_create_stanza_id() and moved it to src/xmpp/connection.c. Discussion happened in https://github.com/boothj5/profanity/pull/1010