[Mainline Feature] Add getEntitiesWithinBB in World #197
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This pr adds two methods
public <T extends Entity> List<T> getEntitiesWithinBB(IBoundingBox bb, Class<T> type)and
public <T extends Entity> List<T> getEntitiesWithinBB(IBoundingBox bb , Predicate<T> filter, Class<T> type)to improve performance when trying to get entities within given BB (think hopper)
It would be a disaster to use old
getEntitieswhich iterates the whole world even if we only want to scan a small space, and I think the cost of converting and casting Minecraft entities again here is reasonable