* use String.raw for css escapes
This will allow us to write code like:
```css
.mobile\:font-bold {}
```
Instead of
```css
.mobile\\:font-bold {}
```
Which resembles "real" css way better in our tests.
* use String.raw in integration tests as well
* splitup nameClass functionality
We want to separate the logic of the formatting the class and of turning
it into a class with a `.` and escaped values.
* collect base classList
* implement `safelist` where you can use regex patterns
