Add support for code select of anonymous inner class type name

[eric-milles]

Consider the following

def runner = new java.lang.Runnable() {
  void run() {
  }
}

Code select (Ctrl+click or F2 or F3) or hover on package "java", package "lang" and type "Runnable" should be supported. Also, type may be partially-qualified (like "Map.Entry") or unqualified.

[eric-milles]

org.codehaus.groovy.eclipse.codebrowsing.requestor.CodeSelectRequestor.getRequestedElement() is returning null for InnerClassNode "Script$1".

[eric-milles]

type.getUnresolvedSuperClass() is returning Object, not Runnable in:

    public void visitConstructorCallExpression(ConstructorCallExpression node) {
        boolean shouldContinue = handleSimpleExpression(node);
        if (shouldContinue) {
            ClassNode type = node.getType();
            visitClassReference(node.isUsingAnonymousInnerClass() ? type.getUnresolvedSuperClass() : type);

[eric-milles]

Runnable is an interface, not a superclass.