PlasmoidHeading: add backgroundColorTint property for optional color tint

Closed Nate Graham requested to merge ngraham/plasma-framework:plasmoidheader-tinting into master

This new property allows the developer to optionally specify a color to tint the header, which may be useful to draw attention to an applet or popup, or to indicate a different status.

CCBUG: 420541

Here's an example:


Edited by Nate Graham

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