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
* @param converter
	 *            <code>null</code> allowed and will remove all existing
	 *            converters.
	 * @return this BindSpec, to enable chaining of method calls
	 */
	public BindSpec setTargetToModelConverter(IConverter converter) {
		targetToModelConverter = converter;
		return this;
	}
	/**
	 * @param targetUpdatePolicy
	 *            The targetUpdatePolicy to set.
	 * @return this BindSpec, to enable chaining of method calls
	 */
	public BindSpec setTargetUpdatePolicy(Integer targetUpdatePolicy) {
		this.targetUpdatePolicy = targetUpdatePolicy;
		return this;
	}
	/**
	 * @param updateModel
	 *            The updateModel to set.
	 * @return this BindSpec, to enable chaining of method calls
	 */
	public BindSpec setUpdateModel(boolean updateModel) {
		this.updateModel = updateModel;
		return this;
	}
	/**
	 * @param updateTarget
	 *            The updateTarget to set.