center the outer layer by snapping it to pixels and quantize scale
center the outer layer by snapping it to pixels and quantize scale

snap to 0.5, 0.25 if close to it (and not studio without bezel)
prevents blurry images when container is not even in pixel width/height
prevents blurry images from hard to scale fractions

Actually fixes more pixel cracks then old solution.

The left over bleeding seems to be due to a browser bug in both webkit
and safari: https://bugs.webkit.org/show_bug.cgi?id=173466

koenbok/Framer,koenbok/Framer,koenbok/Framer,koenbok/Framer