+ added biome-specific cave fog colors!
+ improved algorithm for determining if you're above ground (no more darkening under trees!)
+ explained some things better in the config
+ improvements to blindness and darkness effects
* fixed critical bug where config didn't load (whoops!)
* fixed bug where the cave sky appeared underwater
* fixed bug where cave sky didn't exactly match cave sky color
- replaced "fog density" with an easier to understand "fog end"
- removed herobrine