Pewter 1.21 compatibility

I wanted to make the Pewter mod (and its additions) work for 1.21, so I fixed the crashes and moved all the additions into the base mod. I don't care for maintaining it or the modular approach, I just want it to work. 

 

Should be fully compatible with the base mod (meaning you can update from that to this)

 

Once Zach2039 updates their base mod, I will remove this mod.