New forests

In the newly updated forests, there would be hollowed-out, rotting fallen trees and logs. Trees would have small branches and other features from the wild update concept art. Animals would hide in the logs and players could crawl in them. Mushrooms would grow on them and they would get more mossy over time. Wood could spawn with moss on it, it would come in 5 stages, slightly mossy wood, partially mossy wood, moderately mossy wood, mostly mossy wood, and fully mossy wood. Leaves would fall off trees and would die after a while. They would fall and particle effects but would hit the ground as a block, like the pink flowers in the cherry grove biome. They would make a rustling sound when walked on. Theese would apply to all forests biomes.