Happy Ghast anchor point.

THEY'RE SUPER DUPER CUTE! and yeah, i got an idea that if we could have a certain block to mark those ghast so they just roam around the area of the block so they don't wander too far, imagine building a sky city using them ghasts and they wander around the city until you called them using a certain item too! And they went up to you and you finally ride it to go anywhere