Voltex 3.0.2 for NeoForge 1.21.1

First release on NeoForge 1.21.1. The content is the same as Voltex 3.0.2 for Forge 1.20.1: every machine, multiblock, the heat network, the cryo chamber, the electromagnet, nanites, ME ports and the in-game guide.

• Worlds from 1.20.1 do not carry over. Minecraft 1.21 changed how items and blocks store their data, so tool charge, machine contents and other saved values would be lost. Start a new world for 1.21.1, and keep a backup if you try an old one anyway.
• Requires NeoForge 21.1.259 or newer.
• Optional integrations: JEI, Jade, Applied Energistics 2 (ME ports) and KubeJS 7.

For pack makers

• Tags follow the 1.21 c: convention (c:ingots/copper, c:dusts/iron, …) instead of forge:.
• KubeJS recipe syntax is the same as on 1.20.1, every Voltex machine has its schema.
• Fluids in datapack recipes use the 1.21 format {"id": "...", "amount": 1000}. The old {"fluid": "...", "amount": 1000} still loads.