Add Source‑Powered Furnace Upgrade for Magic–Tech Parity

[Eredinn9120]

Context:
ATM10’s progression naturally splits into two major paths:

• Tech, powered by FE (e.g., Applied Energistics 2, Mekanism, etc.)
• Magic, powered by systems like Ars Nouveau

While both branches can interact, resource processing is significantly faster and more efficient on the tech side, making magic‑focused playthroughs fall behind in early and mid‑game automation.

Proposal:
Introduce a furnace upgrade item (or a small bridging mod) that allows furnaces to run on Ars Nouveau’s Source as an alternative to FE. Functionally, the upgrade would let the furnace treat Source as if it were FE, enabling comparable processing speeds.

Why this would improve gameplay:

• Balances tech and magic progression without nerfing either
• Enables viable (almost) magic‑only challenge runs
• Encourages experimentation with alternative progression paths
• Strengthens integration between existing mod ecosystems
• Adds late‑game flexibility, where players often blend both systems anyway

Goal:
Allow players to achieve nearly the same automation capabilities using either tech or magic, making both paths equally fun and competitive.