DECORATIVE LIGHTHOUSE 1.0.3

- Adds an unlimited Decorative beacon to Decorations > Landmarks.
- The decorative copy uses the original Beacon construction cost.
- It has no refugee/unity/unique-building function.
- It requires 1 worker and continuously consumes 10 kW while operating.
- Adds no lights or animation and does not modify the original unique Beacon.
Verified against Captain of Industry 0.8.6c API.
