Customizable script to allow honor from creature kills

* See CONF section: CUSTOM SERVER OPTIONS - CREATURE HONOR
* For existing servers, please import: characters_create_creaturehonor_message.sql
doesn't this declaration fit better in the body of https://github.com/TrinityCore/TrinityCore/pull/13631/files#diff-0ec780579749f5984fad9cf95fb0a48aR268 ?