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
https://github.com/TrinityCore/TrinityCore/pull/13631#discussion-diff-21455491R15511
> Player* owner = killerCre->GetCharmerOrOwner()->ToPlayer();