Bind a viewer in one statement with ViewerSupport

We've added the ViewerSupport class to simplify setting up viewers (including tree viewers), usually in just one statement.

Before:

ObservableListContentProvider contentProvider =
    new ObservableListContentProvider();
viewer.setContentProvider( contentProvider );
viewer.setLabelProvider(
    new ObservableMapLabelProvider(
      BeansObservables.observeMaps(
        contentProvider.getKnownElements(),
        new String[] {
          "title", "releaseDate", "director", "writer" } ) ) );
viewer.setInput(BeansObservables.observeList(model, "movies"));

After:

ViewerSupport.bind(
    viewer,
    BeansObservables.observeList(model, "movies"),
    BeanProperties.values(new String[] {
      "title", "releaseDate", "director", "writer" } ) );

Observe Multiple Selections of Viewers

Thanks to Peter Centgraf and Boris we now have the ability to observe multiple selections in Viewers. To take it for a test drive check out org.eclipse.jface.databinding from HEAD and take a look at ViewersObservables.observeMultiSelection(ISelectionProvider selectionProvider). Technically you can observe the selection of any ISelectionProvider with the API, not just Viewers.

bug 124683