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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labels:
- 'Stage-Stable'
summary: 'Close idle server-to-server connections'
...

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

Some people find it preferable to close server-to-server connections
after they have been silent for a while.

Configuration
=============

...is trivial. The default timeout is 300 seconds (5 minutes). To change
this simply put in the config:

       s2s_idle_timeout = 60 -- or any other number of seconds

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

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  0.6   Works
  0.7   Works
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