walkers 4.2

• fix skeleton not "humanoid"
• entity tags can now be used for skills & blacklist
• small performance patch for the skill system
• add variants menu! (a menu, where you can switch between variants in your in-game HUD)
• add entity arm for horse, donkey, mule, zombie horse, skeleton horse, fox, wolf, strider, warden, allay, vex, creeper, zoglin & hoglin
• fix broken breathing underwater sometimes ignoring limits
• fix FearedSkill not always working
• merge special shape to special variant
• background improvements
• fix MobEffectSkill not working when registered via datapack on 1.20.1
• rework InstantDieOnDamageType
• register SlowFallingSkill for chicken