Significant resdesign of the data model to allow wings to move.
This was necessary to be able to support moving the wings The prior approach was relying on static variables in order to invoke the super() constructor of LXModel in LXModel subclasses. The constructor takes the sub-models. This is a problem if you want to build top down (create a Flight, whcih creates Flyers, which creates Wings, which creates Points), as the lower level has to exist when you instantiated the higher one. That is, to call super(LXModel children) in the WingModel, for example, you need all of the children models created already. But you are in the first line of the constructor, so it is hard to do so. The prior design relied on static variables to achieve this, but this as the problem that then every Flyer has the same wings -- you can't move them individually (since Wings are static variables). This PR refactors the data model so it's built bottom up. THis happens in Model. First it builds the LightPoints, then the Wings, then the Flyers, then the Flight. The Fade test pattern now also moves the wings. Take a look.