Support renaming or transformation of non-standard type variable names

[raner]

With Projo's API scraping facility, there can sometimes be issues with non-standard type variable names that look like Java class names. For example:

public interface ObservableTransformer<Upstream, Downstream> {
    @NonNull
    ObservableSource<Downstream> apply(@NonNull Observable<Upstream> upstream);
}

Projo should offer a way to convert these type variables, at the very minimum by converting them to all upper case (or possibly by removing all lower-case characters).