mod_muc: Added unload, save and restore callbacks to allow reloading code while preserving state

modulemanager: Added reload support, with callbacks for saving and restoring state

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

modulemanager: Fixed error on unloading modules with no handlers

mod_muc: deregister component on unload

datamanager: Change log message from type "warn" to "debug" when loading a file fails

mod_saslauth, mod_tls: minor code cleanup

mod_version: Removed and rearranged some code

componentmanager: Removed unneeded parameter from componentmanager.deregister_component

sasl: Set realm to be the current realm when the client didn't send a realm, or sent an empty one

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