Remove unneeded NBTTagList source

This file only needs to be modified by Forge, so we can just get it
from our shaded dependency.
Add documentation on updating MCPC+
Update to Forge 7.7.1.642
Spigot patch update: 0002 Spigot Changes

https://github.com/EcoCityCraft/Spigot/blob/b18ea2fd6ea3433a81f7647b6010ae0632d0df66/CraftBukkit-Patches/0002-Spigot-Changes.patch