[Pharo-project] Preference initialization

Hi all, while working on the sensor fix I ran across the problem that there is no initialization code for current preference settings, a typical side effect of working with an image. Problem is, that references, in my case to the class InputSensor, can't be found by the usual cross reference methods. IMHO we should come up with "something" so we can re-generate the current preferences from code if needed. That initialization code would also provide the necessary cross references. Not sure how that plays with the pragma preference stuff... Michael