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
* @return this BindSpec, to enable chaining of method calls
	 */
	public BindSpec setUpdateTarget(boolean updateTarget) {
		this.updateTarget = updateTarget;
		return this;
	}
	/**
	 * @param validatePolicy
	 *            The validatePolicy to set.
	 * @return this BindSpec, to enable chaining of method calls
	 */
	public BindSpec setValidatePolicy(Integer validatePolicy) {
		this.validatePolicy = validatePolicy;
		return this;
	}
	
	/**
	 * Sets the validator.
	 * 
	 * @param validator
	 *            <code>null</code> allowed and will remove all existing
	 *            validators.
	 * @return this BindSpec, to enable chaining of method calls
	 */
	public BindSpec setValidator(IValidator validator) {
		targetValidator = validator;
		return this;
	}
}