WIP: RFC: Refresh window shadows

Closed Alice Mikhaylenko requested to merge wip/exalm/shadows into master

Just something that arose from a discussion with Tobias, opening for further discussion.

These are basically elementary shadows ported to Adwaita. That includes: a larger shadow for active window, and a lot smaller shadows for tiled windows.

Other than that, I enabled normal->backdrop decoration transition too, not just backdrop->normal. (though maybe it was disabled because of performance concerns?)

Message dialogs, menus and popovers are unchanged.




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