more etoys cleanup slice

> Hi all,
>
> SLICE-removeBgPaintStickySketch-michael_rueger.1
>
> includes a bit more etoys cleanup:
> - remove StickySketchMorph
> - remove the paint background halo on the world
> - remove related preferences and methods
> - removes empty Etoys system categories
>
> Affects packages Etoys, System and Morphic.
>
> Michael
>
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