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
* Made a change to CMakeLists.txt which allows inclusion of custom scripts. Re-run CMake if you're not starting fresh.
Yeah, I really need to work on my documentation to make your reviews easier....

I had intended, once the script was merged and people used it for a while, to poll the forums wether people wanted different message types and the table would accept a bitmask depending on what message was needed (eg: all info (default), creature type info only, level and pvp info only, etc.) and then add a player console command so they could trigger these themselves.

But, for the sake of time and in case I forget and never get around to it, I will go ahead and make the change. It isn't terribly complicated to change it back later in this case.