prosody: Protect main loop. Dare I say crashing finally becomes impossible.

util.timer: More small fixes I forgot to commit

util.timer: Fix crash when loaded but no tasks set, fix skipping some tasks when multiple set, and one removed

util.multitable: Add mt:search(), use nil for wildcard keys

Better handling of found, but unloadable, core libraries (eg. undefined symbols)

core.xmlhandlers: Optimise completed stanza logic

net/xmppclient_listener: Add some logging and handle unestablished sessions error'ing

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