stanza_router: Removed global function core_handle_stanza

Automated merge with http://waqas.ath.cx:8000/

stanza_router: Cleaner namespace handling

stanza_router: Refactored core_handle_stanza, and added handling for unsupported top-level stanzas

stanza_router: Fire events after all checks

Merging SASL buggy client workaround with current tip.

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mercurial