Rendered font weight increased ver.2->ver.3 on small sizes on Windows

[kiwi0fruit]

Rendered font weight changed ver.2->ver.3 on small sizes (on Windows 1080p monitor). But at the same time I wasn't able to see the difference on high DPI Android tablet. Worth mentioning that I use MacType font renderer on Windows that doesn't use hinting.

I have no idea what brought this change (no difference on Android!) and at the moment I should install ver.2 on PC and use 'Source Sans Pro', 'Source Sans 3' fallback chain.

I guess it worth checking behavior on Linux as it uses the same renderer (MacType is a port of Linux's Freetype to Windows). I bet there would be the same behavior with hinting off.

[kiwi0fruit]

added screenshots

[kiwi0fruit]

might be related to this #170

checking.

[kiwi0fruit]

Yep. that's it (I installed OTF for ver.3). Both DirectWrite on Windows and FreeType in MacType on Windows render otf and ttf differently. Strange but I guess it can't be helped.