* Fixes#2510.
* Added Holink and Wagjak values to their own entries in the refine database.
* Added several anti-hack checks to refine NPC.
Thanks to the suggestion from @mazvi and @Atemo!
* Converted refine_db.txt to refine_db.yml
* Refine success rates can now be set in refine_db.yml. rAthena's default NPCs will respect this database by default.
* Added shadow equipment refiner
Thanks to @Akkarinage @aleos89 @Atemo and @Mikegyver for their inputs.