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.
tests/org.eclipse.jface.tests.databinding/src/org/eclipse/jface/tests/databinding/BindSpecTests.java
/**
	 * Asserts the BindSpec state when using the default constructor.
	 */
	public void testDefaultConstructor() {
		DefaultBindSpec spec = new DefaultBindSpec();
		assertNull(spec.getDomainValidator());
		assertNull(spec.getModelToTargetConverter());
		assertNull(spec.getModelUpdatePolicy());
		assertNull(spec.getTargetToModelConverter());
		assertNull(spec.getTargetUpdatePolicy());
		assertNull(spec.getTargetValidator());
		assertNull(spec.getValidatePolicy());
		assertTrue(spec.isUpdateModel());
		assertTrue(spec.isUpdateTarget());
	}
	/**
	 * Asserts that when a validator is set it will always be the sole validator