Periods in class selectors are not supported

[firstinflight]

I've been using the excellent Base16 Twilight Dark color scheme, and have found that while periods in class selectors are supported in CSS files, they aren't supported in Sass files.

I believe this is supported in CSS by the Attribute ID (either entity.other.attribute-name.id or punctuation.definition.entity—my guess is the latter).

CSS (notice the blue period between the "a" and the "cta-button" class):

Sass (period between "a" and the "custom" class is the same color as the class):

[P233]

This package considers the . is part of the class selector as the # is part of the id selector and the :: is part of the pseudo-element selector. So they shouldn't be highlighted in a different colour.

Highlighting Sass selectors also need to consider interpolations, e.g. .class-#{$variable}, and highlight the punctuations and selector name in the same colour can make things easier :D