Enable Qt support for High DPI icons.
As submitted by Guo Yunhe <firstname.lastname@example.org> on kde-multimedia. In my testing this only applies with QT_AUTO_SCREEN_SCALE_FACTOR environment variable enabled, but does indeed allow for many (not all) pixmaps to automatically load high-res versions (such as from KIconLoader). I consider this a bugfix and the support is non-invasive, so applying to 18.12 and will merge to master separately. Note that the cover art and slider art is still suboptimal.
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