Document how to construct generic track based rides

[halfbro]

There should be documentation going over how to build generic track based rides.

This is probably going to be the largest amount of work in this subsection, because most rides use this style of building. There should be information about using the construction menu in general, what each of the buttons do, using special track types, and probably a couple of other things I'm forgetting at the moment.

This section should not cover things like banking, which will be covered in the roller coaster section.