Serializer for widget types can't handle anonymous subclasses

[jpallas]

Many of the serializers set the "type" field by calling Class.getSimpleName(). This fails if the object being serialized is an instance of an anonymous subclass. Anonymous subclasses may be used in Java and Scala idioms to support terse initialization, such as

new Points() {{
    setX(xValues);
    setY(yValues);
    setColor(Color.RED);
    setOutlineColor(Color.BLUE);
    setSize(20);
}}

Walking up the class chain to find the first class that is neither anonymous nor inner addresses the problem.