DeckEleven's Railroads 2

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- Sandbox: add hardcore level
- Sandbox: random passengers and mail production in cities
- Sandbox: ports can now produce containers
- Fix impossible river crossing by electric lines in some sandbox scenarios
- Fix a rare race condition where trains can get face to face at stations
- Fix Gigafactory production bug
- Fix price calculation when modifying a train
- Fix add missing container car in sandboxes