[Cuis-dev] Button color tweaks

[Luciano Notarfrancesco]

The button rows (the LayoutMorphs that own the buttons) have the same
color, so the buttons are kind of invisible and they look like
undifferentiated strings in a row. This change set tweaks their colors so
that the row where they live correctly adopts the widget color for their
window (instead of the button color from the theme), and the buttons are
colored better for their different states (enabled/disabled, presed, and
highlighted on mouse over).

I guess LayoutMorph>>#adoptWidgetColor: using the theme button color was a
bug, but I'm not sure, maybe there's some logic behind it. Also, I don't
know if we still need the instance variable doAdoptWidgetColor, it seems
hacky, maybe we can remove all that and let them always adopt the widget
color?

Let me know what you think.
Luciano
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