Custom Particles

Added factory function: blockColor
Leaves now use blockColor by default instead of foliageColor (blockColor has better general color matching)
Falling leaves no longer "hit invisible ground" when their lifetime expires (no longer have the possibility of stopping in midair)
Falling leaves now fade out if they fall far enough (based on particle lifetime)

Added requirement types for emitter "require" function: weatherClear, weatherRain, weatherThunder

Custom particles now respect fog, including fog from the fogger mod

Fixed wallfall particles being created twice in the same exact position when created