More work on Barstow

[Please-Pick-a-Name]

• renamed the folder to barstow/simple_traffic
• renamed parts id simple_traffic_barstow to simple_barstow planned: align wheels with original barstow weight adjustment? few more parts/wheels

[Please-Pick-a-Name]

• align wheels with original barstow
• weight adjusted
• lights fixed
• collision adjusted can u take a look @O1LER