Tow Transmissions 2.0

Updated shift logic and added more cars.
Also put a "PHP" prefix on all the transmissions and related parts to help with organization. (Poor House Performance)
Updated list

1. d-series/roamer - 4,6,and 8 speed with torque converters.
   
2. Bluebuck - 4 and 10 speed with torque converters
   
3. Grand Marshal - 4 and 6 speed with torque converters
   
4. Legran - 6 and 8 speed with torque converters
   
5. Van - 4 and 10 speed with torque converters
   
6. Wendover - 6 speed with torque...