Blender Git Loki

UI DPI: use a sharper filter when scaling icons, when the scale matches a mipmap
level, this has no effect, it's for the zoom levels in between. There's a
tradeoff here between blurring and aliasing, I think this looks better.

Before: http://www.pasteall.org/pic/show.php?id=42090
After: http://www.pasteall.org/pic/show.php?id=42091