when listener is enabled

inspired by https://gitlab.gnome.org/GNOME/gnome-shell/blob/0ba346b7504d1d53cb6e107c51e3831fa7983875/js/ui/mpris.js

- If the server implements XEP-0398 we dont need to add the avatar sha
anymore, the server adds it for us.
- It also means we dont have to query our own avatar from vcard at start
because the server tells us the avatar sha that is published with the inital
presence reflection

Dont print it as "old" conversation, instead add the delay timestamp
at the end of the subject

Delay could be encrypted with full stanza encryption

Fixes #9311

Fixes #9309

Fixes #9299