New features

• Allowed to anchant an enchanted book
• Added 'mending' to the treasury diamond clothes
• Added 'swift sneak' enhancement to the treasury diamond leggings
• Added a book enchanted with 'mending' to the illusioner drop
• Added a top pickaxe to the illusioner drop

Refactoring

• Added an underscore to local definitions of drops, effects, and enhancements

Balance

• Reduced twice the drop chance of treasury diamond clothes
• Changed treasury chainmail clothes protection from top to best