Aethersteel v5.6

New aethersteel item textures
Each aethersteel blocks have the same hardness and resistance of netherite but two times better.
Each aethersteel tools have the same attack damage, durability, efficiency, and enchantability of netherite tools but two times better. Attack speed is just the same as the attack speed of each netherite tools.
"Cover me with Aethersteel" advancement is removed and replaced with "Fully Upgraded" advancement, which can be obtained by getting all of the aethersteel armor and tools.
Fixed Aethersteel Knife and Bookshelf recipe not working