International Transtar 4070A update 1.2 for 1.44

1.2 update:

- Trailer hook height fix for "stock" chassis(now on accurate height for stock trailers).

- Replaced Cat C15 engines with some C15 6NZ.

IMPORTANT NOTE: If you currently use Cat C15 engine then before replacing old mod with this update you need to change Cat C15 engine to somethnig else to avoid CTD.