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
public Object convert(Object fromObject) {
			return null;
		}
		public Object getFromType() {
			return null;
		}
		public Object getToType() {
			return null;
		}
	}
	private class Validator implements IValidator {
		public IStatus validate(Object value) {
			return Status.OK_STATUS;
		}
	}
}