Massey Ferguson 5400 Series v1.0

I have decided to tidy up and polish the already existing converted MF 5400 series of tractors. Game log has been cleaned up, refueling fixed, steering angle increased as well as removed the caster leaning of the front wheels when turning, new start and idle sounds for both 4 and 6 cylinder models. I have also added the option for an SMV sign as well as the USA/Canada spec turn signal lights on the front of the cab. Everything else remains the same for now.