Re: [w3c/manifest] Add support for defining a theme color for both light & dark modes (prefers color scheme) (#975)

@aarongustafson, discussed this internally, and we'd like to propose going back to the media queries syntax. The rationale being that, at install time, the browser should take the possible MQ user preference values and convert them statically into something the OS understands (XML or whatever). 

As we discussed, another issue was that we (well, me... my fault 😬) had proposed essentially creating a new query/matching language for this. Feedback I got was, "yeah... cool idea... but please don't do that"... which is fair enough.

The one thing we do need to do, however, is talk the CSS working group to see if we can solve "translations" as a user preference. Personally, I think that makes sense, as it's literally a system user preference, just like dark/light mode is. We would need to bake that into a media syntax somehow ("prefers-languages:" or something).

Also, we are leaning strongly towards simple overrides for matches (even if they are more verbose). That is, if you declare an override, and it matches, that what comes out at the end (even if the set of items in the override is not equal to what is declared in the root).  


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