Tweaks certain repair-related behaviours of minecraft.
Anvil item repair : by default, repairing an item in an anvil quickly increases its repair cost, preventing from repairing the item indefinitely. This plugin allows to make repair not increase the repair cost.
Mending behaviour : allow to change how mending operates. A bit untested, there are currently two modes : classical mending behaviour (allows to define the durability per xp), and repair-cost lowering behaviour where applying the mending enchant actually only decrease the repair cost of the item.