Same mangrove seed growth mechanics for the other trees.

The mangrove will be the first Minecraft tree to have a seed that grows in its leaves. It is something that from the Wild update all the trees should have it and also that each seed of each tree has its own function. Example: Oak trees grow acorns on their leaves and when you take them you can eat them and you can also plant them and an oak sprout appears to become a tree; Fir trees grow pine nuts that can be planted, but they are also used as a better renewable fuel than charcoal and other examples.