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/internal/databinding/ValueBinding.java
private final IObservableValue target;
	private final IObservableValue model;
	private IValidator targetValidator;
	private IValidator targetPartialValidator;
	
	private IConverter targetToModelConverter;
	private IConverter modelToTargetConverter;
	private boolean updatingTarget = false;
	private boolean updatingModel = false;
	private WritableValue partialValidationErrorObservable;
	private WritableValue validationErrorObservable;
	private IValidator domainValidator;
	/**
	 * @param context
	 * @param target
	 * @param model
	 * @param bindSpec
	 */
	public ValueBinding(DataBindingContext context, IObservableValue target,
			IObservableValue model, BindSpec bindSpec) {
		super(context);
		this.target = target;
		this.model = model;
		validationErrorObservable = new WritableValue(context
				.getValidationRealm(), IStatus.class, null);
		partialValidationErrorObservable = new WritableValue(context
				.getValidationRealm(), IStatus.class, null);