mod_pubsub: Support item retraction

mod_pubsub, util.pubsub: Support for unsubscribing

mod_pubsub: Use pubsub_error_reply everywhere

util.xmppstream: Fix logger name.

mod_disco: Don't add caps hash to stream features on unauthenticated connections.

mod_proxy65: Add service discovery identity and feature, to help out mod_disco when loaded on a normal host.

mod_proxy65: Cleaned up stanza processing a little.

mod_proxy65: s:len() -> #s.

mod_proxy65: Make some globals local.

mod_proxy65: :sub(n):byte() -> :byte(n).

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