Include lighter hinting for ClearType environments

[Nikolaus Waxweiler]

Currently, the Ubuntu fonts are hinted to look almost good on Windows 95. This specifically means that stems are snapped to full pixels on both axes so that they mostly render cleanly in monochrome mode. This is especially visible if you look at a waterfall rendering of the font.

This sadly foregoes the increased (perceived) resolution you have in ClearType/DirectWrite for a smoother display of the font with less distorted shapes.

Microsoft's VTT 6.x ships with an autohinter that uses the same "light" hinting strategy as ttfautohint: http://typedrawers.com/discussion/1406/microsoft-visual-truetype-6-10-with-autohinter-available-for-download

I'd like to see an additional hinting path added to the fonts that checks for a ClearType/DirectWrite environment and then uses a light hinting strategy that basically adjusts outer parts of stems to the pixel grid while leaving the rest alone.

[Nikolaus Waxweiler (madleser)]

https://blogs.msdn.microsoft.com/fontblog/2016/07/08/the-new-res-hinting-aka-smart-hints/