Rustling Leaves

Added

• Compatibility with Immersive Weathering (1.21.1 port): its leaf piles are now drawn as Rustling Leaves litter instead of flat blocks - soft, rounded piles that blend into the forest floor and into each other, in the color of the tree they came from. A pile stays as long as its block: when Immersive Weathering lets it grow, leaves fall onto it from the tree above and it fills up with them like any other leaf pile; it rots away as Immersive Weathering decides, and breaking it throws up a handful of leaves. Piles stacked higher than a block are one tall pile. Leaves falling onto a pile stay on top and are blown and kicked around as anywhere else.
• New client option leaves.immersiveWeatheringPiles to keep Immersive Weathering's own leaf pile look instead; falling leaves then land on top of the piles instead of sinking into them.