Expensive Zombies

[+] Added Whistle: Attracts zombies within a 32‑block radius, no cooldown.
[+] Added TNT Arrow: Can be crafted using TNT and an Arrow. Zombies will aggro on whoever fired this arrow.

Mechanics:

[Zombie Break Block] Zombies gradually break blocks (e.g., stone > cobblestone > gravel > air) (Configurable)
[Zombie Chat React] Zombies react to chat messages within a 32‑block radius and start attacking the player.
[Zombie's Only] You can disable the spawning of other mobs, including modded ones, via config - just list them, or disable existing mobs in the config!
[Zombie's Panic] At low HP, zombies have a chance (configurable) to flee from you and call for help from other zombies within a 20-block radius.
[Zombie Enhanced] Zombies are strengthened - they have more HP and deal more damage. (Configurable too!)
[Zombie Night Mode] Zombies are stronger in the dark: their detection radius increases to 64 blocks, and they move faster. Near light sources, they start to slow down.
[Zombie Attract] Zombies react to light sources and will walk toward them - similarly to the whistle or chat.
[Sneaking] While sneaking, zombies will notice you less. If you're wearing a zombie head, they'll only spot you at close range or if you attack another zombie.