Add vCard support
Only nicknames, photos, birthdays, addresses, telephone numbers, emails, JIDs, titles, roles, notes, and URLs are supported Due to the synopsis array not having enough space, `/vcard photo open-self` and `/vcard photo save-self` are not documented properly in the synopsis section of the `/vcard` command, but they are documented in the arguments section Fixed memory leak in vcard autocomplete (thanks to debXwoody)
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