PropertiesInterceptor does not use value stack to set properties

The PropertiesInterceptor sets properties on EITHER the action or the model (ModelDriven actions). This is inconsistent with the way that property getters are used. If the stack is used to set properties it allows values to be set on both the action and the model. This is useful where the model captures form data and the action captures form navigation (eg 'Next', 'Cancel').