Add overhauled illumination, fix bow item render.
Add NEI as compile-time dependency
- Fix illumination not working on some blocks that it should
- Fix illumination being opaque
- Fix arrows disappearing when hitting already illuminated sides
- Fix blocks dropping from illuminations in creative mode
Fix magic illuminations not rendering
Merge pull request #4 from tterrag1098/master

Add overhauled illumination, fix bow item render.