Changes

For backward compatibility so far existing wheels are F- and R-typed wheels nad wheel parts (tire, disc, hub ...). They are mounted on locator of with the same single letter tag and expected to be stored in similarly named folders with similar unit names(including wheel parts - tire, disc, hub ...). All old wheel data thus work exactly the sameas before. But in addition you can create new types defined by different letter that are used and controlled by chassis model and its locators, but shared between vehicles still. Sets of truck and trailer wheels are separated much like before.