|#98 Convert some to AnyVal, use `asJava` consistently to get Java POJO

* Any wrappers that did not require extending any other traits have been
converted to AnyVal instances.
* Wrap class named to Self indicating that it allows further invocations
on Self, fluent style.
* VertxWrapper converted in AsJava, which is an optional trait that
should be extended by any wrapper traits that require accessing the java
object before this has been concretely instantiated in the wrapper class.
* Removed all Wrapped* classes and just merged them into their
corresponding trait.
* All wrapper classes have been made final.
* Added missing javadoc and corrected where necessary
* Added missing copyright notices
* Separate Vertx into a separate class. This avoids a type erasure
compilation error.
* All wrapper classes now have a private constructor. All of them have a
companion object as well that allows them to be instantiated publicly, if
needed.
* Internally, AnyVal instances are instantiated via constructor to avoid
having to call the factory method even if the underlying Java object is
the same.