XEP-0153: vCard-Based Avatars - Update

Description

http://xmpp.org/extensions/xep-0153.html explains a way to trigger update on a user avatar photo via presence.
Add this support as an extension that developer needs to enable in order to get vcard event something like PHOTO_UPDATE

Environment

None
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Assignee

Mark Walters

Reporter

Juga Paazmaya