Polearms

Updated to MC1.10.2 and Forge 2254.

There are a couple of spots that could cause a NullPointerException. This is why this isn't a release. That said, I have not yet gotten a crash out of it.

I'm still using a few deprecated methods, mostly in item registration, so this is not finished yet.

EDIT: The new item registration method is proving a pain in the butt to use. I can't get the items to persist in the world with it.