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
* creation time
	 * 
	 * @return the observable list containing all bindings
	 */
	public IObservableList getBindings() {
		return unmodifiableBindings;
	}
	/**
	 * Returns an observable value of type IStatus, containing the most
	 * recent partial validation error
	 * 
	 * @return the validation error observable
	 */
	public IObservableValue getPartialValidationStatus() {
		return partialValidationStatus;
	}
	/**
	 * Returns an observable value of type IStatus, containing the most
	 * recent full validation error, i.e. the last element of the list returned
	 * by getValidationErrors().
	 * 
	 * @return the validation observable
	 */
	public IObservableValue getValidationStatus() {
		return validationStatus;
	}
	/**
	 * Returns an observable list with elements of type IStatus, ordered
	 * by the time of detection
	 *