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.core.databinding/src/org/eclipse/core/databinding/DataBindingContext.java
* Policy constant specifying that update or validation should occur
	 * automatically whenever a bound observable object generates a change
	 * event.
	 */
	public static final int POLICY_AUTOMATIC = 1;
	/**
	 * Policy constant specifying that update or validation should only occur
	 * when explicitly requested by calling {@link #updateModels() } or
	 * {@link #updateTargets() }.
	 */
	public static final int POLICY_EXPLICIT = 2;
	/**
	 * Constant specifiying that validation or update events from UI observables
	 * should be triggered early, typically on each keystroke.
	 */
	public static final int TIME_EARLY = 0;
	/**
	 * Constant specifiying that validation or update events from UI observables
	 * should be triggered late, typically on focus lost.
	 */
	public static final int TIME_LATE = 1;
	private List bindingEventListeners = new ArrayList();
	private WritableList bindings;
    
    /**
     * Unmodifiable version of {@link #bindings} for exposure publicly.
     */
    private IObservableList unmodifiableBindings;
	private List bindSupportFactories;
	protected DataBindingContext parent;