Some Decisons

Wrestling with the Rect (x1, y1, x2, y2) versus Rectangle (x1, y1, width, height), I eventually decided there'd be less code wasted by going over to the Rect as standard, particularly appropriate for Zones, and making the position (x1, y1) and size (width, height) of the Sprite as Points.

Another decision is that Sprite position will be the position of the Sprite centre.

When to scale the Sprite image(s) for screen size? This should be done at scene change, not "just in time".

There is also a scale factor for Sprites which is independent of screen size, and can happen during a scene. This should be done "just in time".

The new Pause facility will act like an Inventory scene, with all the features previously supplied by Javascript buttons - music, save/restore, Inventory.