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Highlight: Add API to let callers use an "inactive highlight" effect

A pattern used in a variety of widgets is to have an "inactive highlight" effect. This is for items that are marked as hovered or selected when something else with focus is currently hovered or selected; the inactive thing keeps the same visual state, but with reduced opacity.

All widgets that currently use this paradigm roll their own implementation of it. Let's make it possible to do it centrally by adding some new API.

Part of plasma-workspace#97.

It looks like this:

image

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