code on Nostr: render mentions in previews (William Casarin) cleanup some warnings (William Casarin) ...

render mentions in previews (William Casarin)
cleanup some warnings (William Casarin)
update nostrdb (William Casarin)

pushed to notecrumbs:refs/heads/master
http://git.jb55.com/notecrumbs/commit/0e7b8d7c98dc72a49a89233c736766691c1536b6.html