Support OpenType text hinting

[kleinesfilmroellchen]

Text hinting is a computer font feature designed to improve the legibility of very small font sizes, where fonts are adjusted non-proportionally and lose some of their unique characteristics in order to be more readable.

16807 basically considers the same issue, but was closed because this specific instance was mostly solved with third-pixel snapping. However, a general solution can only be achieved by implementing hinting.

[MacDue]

I've started prodding this... But this a big yak