Et Futurum Requiem 2.1.3

This build, as well as being an internal clean-up thanks to Gregorius Techneticies, the author known for GregTech, but he's also helped us fix some obscure bugs I wasn't sure how to fix. He also helped me look into some crash issues involving world generation and tile entity-based systems and other critical bugs. This release does not introduce any new content or backports.

Without him, this hofix would not be here today, thank you Greg for your help!