In visual tests we see that Hamming-1 is not as good as
Lanczos-2, however it is about 40% faster, and Lanczos-2 itself is
about 30% faster than Lanczos-3. The use of Hamming-1 has been deemed
an unacceptable trade-off between quality and speed due to the limited
pixel space it operates in, so we pick Lanczos-2 here.
On modern hardware, Lanczos-2 doesn't have any noticeable impact
in normal use.
Round subpixel border widths to nearest integer instead of nearest-below integer.
Split caret widths off from border widths and continue to use rounding to nearest-below integer for that.
Bump Goanna version for visual rendering change.
