[beanutils2] Support for nested properties and automatic conversion.

final DateFormat dateFormat = new SimpleDateFormat("MMMM d, yyyy");
final TransformerRegistry transformerRegistry = new TransformerRegistry()
    .register(new StringToDate(dateFormat))
    .register(new IntegerToString())
    .register(new StringToColor())
    .register(new IntegerToColor())
    .register(new StringToURL())
    .register(new StringToPhoneNumber());
final PhoneNumber phoneNumber = new PhoneNumber();
phoneNumber.setAreaCode("202");
phoneNumber.setPrefix("456");
phoneNumber.setLineNumber("1111");
final Address address = new Address();
address.setStreetAddress("1600 Pennsylvania Avenue Northwest");
address.setCity("Washington");
address.setStateCode("DC");
address.setPostalCode("20500");
address.setCountryCode("US");
final Person person = new Person();
person.setFirstName("Barack");
person.setLastName("Obama");
person.setBirthDate(dateFormat.parse("August 4, 1961"));
person.setEyeColor(Color.decode("#362819"));
person.setHairColor(GRAY);
person.setPhoneNumber(phoneNumber);
person.setAddress(address);
person.setWebsite(new URL("https://www.barackobama.com/"));
assertEquals(person, on(new Person(), transformerRegistry)
    .set("firstName").with("Barack")
    .set("lastName").with("Obama")
    .set("birthDate").with("August 4, 1961")
    .set("hairColor").with(0x808080)
    .set("eyeColor").with("#362819")
    .set("website").with("https://www.barackobama.com/")
    .set("phoneNumber").with("202-456-1111")
    .set("address").with(new Address())
    .set("address.streetAddress").with("1600 Pennsylvania Avenue Northwest")
    .set("address.city").with("Washington")
    .set("address.stateCode").with("DC")
    .set("address.postalCode").with(20500)
    .set("address.countryCode").with("US")
    .get());