Add option to turn off anti-aliasing for editor font.

Thanks for the great product!

Sublime Text allows you to turn off anti-aliasing, which looks great for some fonts:

``` javascript
{
    "font_face": "MS Gothic",
    "font_options":
    [
        "no_antialias"
    ],
    "font_size": 18,
}
```

I've looked around, but there doesn't seem to be an easy way to do this. Is there a way for me to do this in VSCode?
