Project ServerSide - IDAS Loot Fix

Standalone datapack for Minecraft 1.16.5 / IDAS 1.5.5.

Fixes:
- Replaces unsupported minecraft:set_potion loot functions with minecraft:set_nbt while preserving the intended Potion NBT.
- Replaces missing alexsmobs:elastic_tendon with minecraft:string.
- Replaces missing biomesoplenty:hair with minecraft:string.

Install:
Place this ZIP directly in the world's datapacks folder. For a modpack-wide default, include it with your pack's mechanism for automatically supplying datapacks to new worlds.

This datapack intentionally does not alter IDAS structure spacing/density. Those remain in config/idas.toml.
