stanza_router: Skip prepping 'to' in many common cases - #optimization

stanza_router: Skip prepping 'from' on c2s origins - #optimization

stanza_router: Fixed a corner case where processing could continue after an error reply

stanza_router: A little refactoring

componentmanager: Using prosody.events instead of core.eventmanager

Main: Don't use empty event data objects for some global events. Some handlers don't expect it.

Main: removed some eventmanager references (replaced by prosody.events)

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