normalize some of remaining test/samples to extend Application.Adapter (as most our classes already do now) instead if implements Application.
Note that classes implementing Application now can stay as-is (because it's right or maybe they are important examples made time ago and are referenced in web pages that way).

git-svn-id: https://svn.apache.org/repos/asf/pivot/trunk@1536166 13f79535-47bb-0310-9956-ffa450edef68