[FIXED]$0 Component/Vehicle

[Arakash]

I have 3 components in my current game, which all have a cost of 0.
They are 14-20 years old and have been produced and contracted lot, they are probably crap by now, but imo it should cost more than 0 to make them.

It also seems to break vehicles as well if you try to make a vehicle using those components.
I also made a vehicle that apparently costs $0 to make if you turn down all its cost sliders.

[Eric.B]

Parts older than a certain year will stop decreasing in price as well as vehicles.
I've also adjusted the amount prices can fall and put a minimum amount of costs...

This should prevent $0 units, but if it does not please let me know.