mod_firewall: Initialize compiled chunk just once for all handlers This should fix a case where some stateful dependencies (such as throttles) produce separate instances for every call to new_handler(), leading to surprising behaviour (e.g. rules executed via JUMP CHAIN vs ::deliver would have separate rate limits). This also adds better error handling in case the compiled code fails to run for some reason.

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labels:
summary: Report server uptime in presence
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Introduction
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This module simply responds to a presence probe sent to the server with
a presence staza containing a timestamp from when the server started.

This is imagined as an alternative to the XEP-0012 "Last Activity"
protocol that can seem a bit overloaded.