Support BGR subpixel layout on Windows

First of all, thank you for this nice library and the alacritty terminal that uses it.

This issue is for alacritty, but I think the appropriate place for it is here.

On windows, when using a `BGR` monitor / TV, the font rendering is very ugly (with noticeable color fringes).
On linux, this was fixed, according to https://github.com/alacritty/alacritty/issues/4100 (AFAICT the fix was implemented in this library).

Adding some reference info, on how to detect which subpixel layout is used on Windows (in case it may be useful):

[Microsoft docs](https://learn.microsoft.com/en-us/dotnet/desktop/wpf/advanced/cleartype-registry-settings?view=netframeworkdesktop-4.8#pixel-structure)

[Investigation by BetterClearTypeTuner (2019)](https://github.com/bp2008/BetterClearTypeTuner/wiki/ClearType-Investigations)

Thank you again for your good work!