Address TODO under importToString

[wmjoubert]

Implemented it like this since I need it for the project I'm working on. Handles most common cases. Will add a test if you approve. I suspect NameOrUri should be moved to Css.elm and possibly renamed to NameOrUrl with an Url tag instead of Uri to be more inline with the CSS semantics.

[rtfeldman]

Love it! Some thoughts:

• 👍 for changing it to NameOrUrl
• Would love some tests!
• Structure shouldn't depend on anything from Css, so defining it there makes sense—but I think having Css import and then re-export both NameOrUrl and its two constructors is a good idea.

Thanks for this! 😄

[wmjoubert]

Could not find a way to re-export a union so created name and url functions in CSS instead. If you prefer the tagged type and know how to re-export them please let me know. I'm also not entirely sure how you intended setting things like imports and charset on a Stylesheet - returning a modified record like in the added test at the moment.