Enchantment Overhaul

Changes

• New shield enchantment, Parry. Blocking within fifteen ticks of raising an enchanted shield throws the attacker back and costs the shield no durability. Holding the shield up past that window behaves like an ordinary shield, so it rewards timing rather than acting as a permanent bonus.
• Shields now have three enchantment slots and can be brought to the catalogue, which also lets them take Mending.
• Parry books generate in pillager outposts, around five percent, and in trial chamber reward chests, around eleven percent.