pixmirror: refactor top
pixmirror: run convert in place
pixmirror: pull resize(), getNewPix() and pad() to subs
pixmirror: pull getResizePercent() and isOrientMatch() to a sub, call getPix() exactly once
pixmirror: add --rotate/--no-rotate args to rotate images to match orientation
bg-pixmirror: rotate n9 pixmirror
pixmirror: run convert exactly once per image
bg-pixmirror: make a center-padded n9 pixmirror
stepmania: fix keyboard keys spacing
pixmirror: convert => mogrify, to avoid creating tmp files
pixmirror: sharpen downscaled images