mod_vcard_muc: Add an alternative method of signaling avatar change When the avatar has been changed, a signal is sent that the room configuration has changed. Clients then do a disco#info query to find the SHA-1 of the new avatar. They can then fetch it as before, or not if they have it cached already. This is meant to be less disruptive than signaling via presence, which caused problems for some clients. If clients transition to the new method, the old one can eventually be removed. The namespace is made up while waiting for standardization. Otherwise it is very close to what's described in https://xmpp.org/extensions/inbox/muc-avatars.html

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summary: HTTP favicon
...

Introduction
============

This simple module serves a `favicon.ico` from prosodys HTTP server and
nothing else.

Configuring
===========

Simply load the module. The icon can be replaced by adding a `favicon`
option to the config.

    modules_enabled = {
        ...
        "favicon";
    }

    favicon = "/path/to/my-favicon.ico" -- Override the built in one

Compatibility
=============

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  trunk   Works
  0.9     Works
  0.8     Doesn't work
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