Add 2x icons for retina displays.
This change updates the mode selector/fancyactionbar in Qt Creator with new high-resolution icons. Set Qt::AA_UseHighDpiImages on Qt 5.1 and higher to make QIcon generate high-dpi pixmaps. Add "@2x" mode images. Update StyleHelper::drawIconWithShadow to handle high-dpi pixmaps. The shadow-drawing algorithm is kept in device pixels. Change-Id: I411b7a24e534a2d75a1bbdc4d10219dcbea26bed Reviewed-by: Jens Bache-Wiig <firstname.lastname@example.org>
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