Entity Serialization

Allow serializing an Entity to raw NBT, and to get an Entity object without spawning it into the world.
Prevent crash from stack overflow in doPhysics
Invalidate Metadata on reload

Metadata is not meant to persist reload as things break badly with non primitive types
This will invalidate metadata on reload so it does not crash everything if a plugin uses it.
Teleport passenger/vehicle with player

Will teleport entities with a player for vehicle/passenger