Make Trees In Forests Taller + More

Makes trees in forests taller by 2 and 3 blocks more than currently and make them slightly more spaced out from each other, reduce by 50% the leaf litter found in certain forests and add leaf litter in jungles and pale gardens + small bolders of stone and moss.

This change is necessary to encourage players for horse travel through forests, because there isn't enough space for horses to go through. And the rest is just more esthetic.