Reimagined + Global Illumination Fork

numerous minor changes

• decoupled ACT from GI for very mild performance improvements
• incorporated backface light leak rejection
• rebalanced color and lighting (fixes neon grass)
• various adjustments to config for performance and visuals in GI-DEFAULT profile
• excluded certain partial transparent blocks from producing GI
• added versions down to 1.13.x. I haven't tested these, but I don't know why they wouldn't work. if something is incompatible, message me on Discord
• bugfixing

Known problem(s):

1. cave GI light leak around sunset/sunrise
2. minor hand rendering order bug
3. greater voxy/real chunk disparity due to GI's color influence