Tiered Shields

Add 4 new shields, the golden shield, the copper shield, the diamond shield and the netherite shield, and tweaks the default shield (now iron shield):

All shields now take only 1 durability damage when blocking damages All shields can still be conbined with a banner

Golden shields block always 1 damage and 40% of the total damages, they have 112 durability and can be repaired with gold ingots unless every other shields they can block damage with 0s delay, instead of the vanilla 0.25s delay.

Copper shields block 1 damage and 40% of the total damages, they have 176 durability and can be repaired with copper ingots.

Iron shields block 2 damages and 60% of the total damages, they have 240 durability and can be repaired with iron ingots.

Diamond shields block 3 damages and 80% of the total damages, they have 528 durability and can be repaired with diamonds.

Netherite shields block 4 damages and 90% of the total damages, they have 592 durability and can be repaired with netherite ingots, unless other netherite based equipment the netherite shield is crafted in a crafting table and not upgraded from a diamond shield in the smithing table, this si due to datapacks limitations with custom items crafting.