This adds a hover effect so the user knows it's a button.
Unlike the application-menu button, I didn't add the smallSpacing around it so it's the same size a before. Unfortunately the hover outline looks a little bit weird but mehCreates a reuseable SmallToolButton which overlays an IconItem on a ToolButton ignoring the svg's margins and ToolButton's padding.
Changes the spacing between the rows to 1px (0px causes the ColumnLayout to reflow and the label sometimes shifts).
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