New features

• Added 'remove-when-far-away' flag
• Added Entity-specific attributes for Creepers, Horses, and Rabbits
• 1% of Creepers are powered, have higher movement speed and max health and explosion radius, explode immediately on the player contact
• 5% of Horses have the best maximum health, improved movement speed and knockback resistance
• 1% of Rabbits are the killer bunnies

Bugfixes

• Returned "WITHER_SKELETON" to "SKELETONS"