Update all old scripts

[Vequinox]

Look at the following scripts and see if any need updating as models might have changed from 1.16 to 1.19:

• Stonecutter recipe script
• Blockstate scripts
• Block/Slab/Wall model scripts
• Block/Slab/Wall registry scripts
• Item model script
• Lang script
• Loot table scripts
• Tag script

[GirafiStudios]

Moved to using proper snake_case for registry names. Means any script that references the block registry name, will need changing.