Space Age Bonus Scaler

Tame the OP Space Age bonuses with independent multipliers for:
- Base Productivity (Foundry 50%, Electromagnetic Plant 50%, etc.)
- Resource Drain (Big Mining Drill: 50% less ore consumed)
- Science Drain (Biolab: 50% fewer packs)

Default: 0.5 (halves all bonuses for balanced vanilla+ play).
1.0: Pure Space Age. 0: No bonuses. 2.0+: Double down!
Range: 0–10 per slider. Works with any mod adding similar bonuses.