Utilities to help create the UI for a Java-oriented project.
{@link org.netbeans.spi.java.project.support.ui.PackageView} supplies a
package-oriented view of a Java source root, which you may wish to use as a part
of your project's logical view.
This handler is used by PackageViewChildren.PackageNode.setName() method.
PackageNode.setName() uses Lookup.getDefault() to lookup for instances of
packageRenameHandler.