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

mod_register: Fixed an error happening during account deletion

MUC: Added copyright notice

MUC: Replaced some duplicate code

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