Fix up visitor approach.

The existing code used a catch-all `visit()` method, and then relied on overloading to find the right version (allowing fallback to a `visit()` method taking a base-class parameter).
This approach works, but has some big down-sides:

- When browsing the code, you have a bunch of identically-named methods, and it can be hard to find the one you want.

- It is impossible to use inheritance to implement fallback for `visit()` methods, because *any* method in the derived class with that name hides *all* methods with the same name in a base class

This change makes the `visit()` methods use the name of the corresponding syntax class, and then has visitors inherit the fallback methods they need from the base visitor template class.

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