mod_smacks: Stop stanzas from being queued on hibernation timeout This overloads that flag a bit, but it has the intended effect of stopping outgoing_stanza_filter() from queueing stanzas. Fixes a traceback because of the queue having been removed somewhere around here, since it is no longer needed. Thanks Martin for reporting

util.smqueue: Simplify compat table, fix dependent modules (thanks Martin) There was an off-by-one in the modulo calculation. Switching to a plain old array-table makes the apparent size of the queue wrong, but since some of the queue may not be available this is likely for the best.

util.smqueue: Add missing method to Teal record spec

mod_smacks: Limit queue memory consumption using new util This brings back the queue size limit that was once added, then removed because destroying the session when reaching the limit was not great. Instead, the queue wraps and overwrites the oldest unacked stanza on the assumption that it will probably be acked anyway and thus does not need to be delivered. If those discarded stanzas turn out to be needed on resumption then the resumption fails.

util.smqueue: Abstract queue with acknowledgements and overflow Meant to be used in mod_smacks for XEP-0198 Meant to have a larger virtual size than actual number of items stored, on the theory that in most cases, the excess will be acked before needed for a resumption event.

mod_smacks: Set a watchdog to watch sleeping sessions Extending the timeout by poking the watchdog, and letting it go on resumption, should be much better than the previous method.

mod_smacks: Switch storage for tracking resumption tokens All that was a complicated way to limit the number of resumable sessions. Let's control resource usage some other way. This leaves the essence of mapping resumption tokens to live sessions. This keeps resumption state across reloads.

mod_smacks: Clear resumption token from persistent storage on resumption

mod_smacks: Persist old counter values to storage This allows clients that try to resume a session after a server restart to at least know which of their pending outgoing stanzas were received and which need to be re-sent. This removes the limit on how many of those counters are kept, which should be fixed eventually.

mod_smacks: Remove now unused variable [luacheck]