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/BindSpec.java
private Integer modelUpdatePolicy;
	private IValidator partialTargetValidator;
	
	private IConverter targetToModelConverter;
	private Integer targetUpdatePolicy;
	private IValidator targetValidator;
	private boolean updateModel = true;
	private boolean updateTarget = true;
	private Integer validatePolicy;
	/**
	 * Default constructor that initializes all objects to their defaults.
	 */
	public BindSpec() {
	}
	/**
	 * Returns the validator to be used, or <code>null</code> if a default
	 * validator should be used.
	 * 
	 * @return the validator, or <code>null</code>
	 */
	public IValidator getDomainValidator() {
		return domainValidator;
	}
	/**
	 * Returns the converter to be used, or <code>null</code> if a default
	 * converter should be used.
	 * 
	 * @return the converter, or <code>null</code>
	 */
	public IConverter getModelToTargetConverter() {