Bug 167450 [DataBinding] Get rid of bind support factory magic
I finally realized that we don't need that other magic factory. I'll move fillBindSpecDefaults() and the methods it calls (createConverter, createValidator etc) to a new class DefaultBindSpec. Clients who want default validators and converters created for them just create a DefaultBindSpec as opposed to a (rather empty) BindSpec. I will also move the early type checking into DefaultBindSpec to make it optional as well.
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/viewers/UnorderedTreeNode.java
* Disposes this node and removes all remaining children.
     */
    public void dispose() {
        if (children != null) {
            if (listeningToChildren) {
                contentProvider.remove(treePath, children, true);
                children.removeSetChangeListener(this);
                children.removeStaleListener(this);
            }
            children.dispose();
            children = null;
            
            if (listeningToChildren && isStale) {
                contentProvider.changeStale(-1);
            }
        }
    }
    
    /**
     * @return
     */
    public boolean isDisposed() {
        return children == null;
    }
    
    /**
     * Returns one representative parent, or null if this node is unparented. Use
     * getParents() to get the complete set of known parents.
     * 
     * @return