[core] Added the getAncestor(Class<E>) method to the TestClass and TestMethod classes to support DLTK 5.0.
[launch][ui] Improved the TestLifecycle.hasErrors() method.
[ui] Renamed the icon rerunTestAction.gif to rerun_test.gif.
[ui] Renamed the icon runAllTestsAction.gif to run_all_tests.gif.
[ui] Renamed the class StopTestHandler to StopTestRunHandler.
[ui] Renamed the class StopTestAction to StopTestRunAction.
[ui] Renamed the icon stopTestAction.gif to stop_test_run.gif.
[ui] Changed the icon for the Test Outline view to makegod.gif.
[ui] Removed testOutlineView.gif.
[ui] Removed unnecessary spaces from properties.