Craftable Chainmail Armor

Adds chainmail as a crafting ingredient. 

Adds crafting recipes for chainmail helmet, chestplace, leggins and boots as well as horse armor.

Changes the repariing ingredient for chainmail items to chainmail as opposed to iron ingots.

• Added a version for MC 1.21.7
• Added a version for MC 1.21.6 
• Added a version for MC 1.21.5
• Initial version for MC 1.21.4

My other mods:

• Better Books
• Craftable Bronze Armor and Tools
• Craftable Copper Armor and Tools
• Craftable Horse Armor Plus
• The Dark Tower - Generates a large tower with a deep unground maze with mob spawners and loot.
• Small Tower
• Tin Ore with WorldGen
• Turtle Wolf Armor