Improve Page Object Model

[wurzelkuchen]

As discussed previously our page object model has some design flaws which could be handled more elegantly.

Please rework the abstract components and abstract page objects to better match the java naming conventions and offer a slightly different set of methods.

public abstract class AbstractComponent<T extends AbstractComponent<T>>
{
    abstract public boolean isComponentAvailable();

    abstract public T validateStructure();
}

and

public abstract class AbstractPageObject<T extends AbstractPageObject<T>>
{
    //....

    public abstract boolean isExpectedPage();

    public T assertExcpectedPage()
    {
        SelenideAddons.wrapAssertionError(() -> {
            Assert.assertTrue("Page could not be identified", isExpectedPage());
        });
        return (T) this;
    }

    public abstract T validateStructure();
}