Add configuration and classes for the Eitr Refinery

[shawnwallace]

Uses the same mechanics as the other "smelters", except with different materials.

[MueR]

@JcBernack any chance this could get merged? Really hoping to get this soon.

[JcBernack]

MueR commented

Hehe, me too, but I am not a maintainer here.

[healiha]

Approved but only @nxPublic can merge on the project.

Thanks for fixing some old issues too!