[FIXED]Engines layout

[Frankschtaldt]

Considering the fact most DOHC's engines are 4 valves, and a good number of SOHC are 2 valves, I think adding this extra layer of detail is a little much.

So valvetrain configuration will probably make its way into the game (combined with engine layout) but don't expect valve numbers or fuel delivery systems.

I've just realized a problem with this approach. 2 stroke engine don't use any valve train at all. They just use holes cut into the sides of the cylinders to port gasses in and out. That means you would need to add 2 stroke to all the layouts as well as having it as it's own fuel type.

My alternative suggestion is to have valve train built into fuel type instead.
Giving you the following:
2 stroke gas
4 stroke gas - sleeve valve
4 stroke gas - side valve
4 stroke gas - ohv
4 stroke gas - ohc
4 stroke gas - dohc

That covers all of the major categories whilst actually reducing the number of different new entries you need to make in the XML files.