More passive and agressive mobs for Mushroom Fields biome

Currently, Mushroom Fields is the most neglected biome in the entire game. It needs more variations of mushroom mobs.

1. Passive ones: Mushroom - Chicken, Pig, Sheep, Horse, Donkey, Mule, and Llama.

2. Aggressive ones: Mushroom - Skeleton, Zombie, Spider, Creeper, and Slime.

Each one of them would have its own unique sounds: Ambience, attack, taking damage, and death.

They would sound much different than their original counterparts.