Make --font-ratio switch apply to sixels

[hpjansson]

It's useful to be able to set the font ratio manually for terminals with a fixed 10x20 virtual cell size. See #225 and #214.

[johnd0e]

Any progress with this?

[j4james]

@johnd0e It's worth noting that Windows Terminal has settings for adjusting the line height and cell spacing of your font, which you could potentially use to bring the aspect ratio closer to 1:2. That would be another way of addressing this issue.

I don't know how well that would work with your particular font, and it might not be something you would like, but I thought it worth mentioning anyway.

[johnd0e]

@j4james Good to know!
Is it possible to achieve with openconsole.exe alone?

[hpjansson]

@johnd0e Zero progress, sorry. It sort of fell by the wayside while I was focusing on other stuff. I'll try to include it in the next release.

[j4james]

Is it possible to achieve with openconsole.exe alone?

I've just had a dig through the code, and it doesn't look like it. Those settings only seem to be supported by Windows Terminal.