Feat/active cell wrapper #27
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Context
For rare situations, you may want to render a different background for the active selection and then paint over that with the selected cell content. This wrapper enables that.
I encountered this when trying to have SwayzeTable look like the original VisiCalc which I am preparing as a demo of this great open source engine.
Approach
Introduced a wrapper similar to the header, body and box wrappers. Needed to position the wrapper to simplify the widget tree without having to implement a customer painter.
Focused on activeRect (Active cell Rectangle) for this wrapper, could be expanded to support selectedRect (Selection Rectangle) but wanted to keep the scope small for a pull request/feature.