Cleanup "Multi-block Inspector"
Multiblock inspector has several issues.
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Often widget is not wide enough and the icons for color/opacity get hidden. Esp. true if block names are long.
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When a color/opacity is set, it's background becomes black -- looks quite ugly.
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Developer issue: unify codebase with other areas in the UI where composite-data hieararchy is shown e.g. Information Panel, UI for Extract Block filter.