Improves the fully industrial synthetic-rubber route in TIMSABA without requiring biological processing.

• Steam cracking uses 64 Butane + 64 Steam to produce 64 Benzene + 64 Hydrogen.
• 32 Styrene + 32 Butadiene produces 64 Liquid rubber instead of 16.
• The original Naphtha-to-Butadiene route and biological rubber recipes remain unchanged.

Designed for TIMSABA 1.13.1 on Factorio 2.0.