Graphics changes

[Todd Fleming]

This adds painting and event handling to SceneElement.

Caution: buggy.  I'm posting this to get help from Brian.

To try it
======
(different from src/ui/README)

ExternalMethod.
lobby ensureNamespace: #Graphics &delegate: True.
load: 'src/ui/region.slate'.
load: 'src/ui/transform.slate'.
load: 'src/ui/color.slate'.
load: 'src/ui/colors.slate'.
load: 'src/ui/event.slate'.
load: 'src/lib/memoryarea.slate'.
load: 'src/ui/form.slate'.

You probably want to save your image at this point.

load: 'src/ui/graphics.slate'.
load: 'src/ui/contextsceneelement.slate'.
load: 'src/plugins/sdl-windows/windows.slate'.
load: 'src/plugins/cairo/cairo.slate'.

addSlot: #w valued: (WindowSceneElement newWidth: 640 height: 480).
addSlot: #r valued: SceneElement new.
r behaviors: {
    PaintSolidBackgroundBehavior newColor: Colors Red alpha: 1.
    PaintChildrenBehavior.
    DragBehavior.}.
w add: r.
w eventLoop.

Todd

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