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

@aarongustafson 

1. I think it's important to figure out whether we're doing the light/dark thing _just_ for an active browser window (e.g. the title bar colour), or if we're intending to apply it wherever a manifest is used (e.g. in OS shelf icons). If it's the former, then I think it's tractable (but still architecturally difficult) to use a CSS MQ since that code resides within the browser. If the latter, it means we need to find a way to translate the MQ condition out into every OS. While Chrome OS is probably easier since we control it, it isn't limitless -- we don't really want to put a CSS engine into the OS app service just to calculate theme colours.
2. Note that "override" is already a word (e.g. `display_override`); I don't think the spelling is a problem (this isn't one of those words that can be spelled two ways, "overide" is simply a misspelling, like "referer" lol).
3. I think we need to workshop the layout of the combined translations / color scheme further, but if anything, if we want to generalize it, I would look at generalizing the top-level object. You have `translations / context` and `user-preferences / context`, and I was suggesting to rename "context" to perhaps `language` and `color-scheme` so it's clear what "type" it has. If you want to generalize it, you might consider generalizing the top-level one to just `alternatives` (for example), with `language` and `color-scheme` as selectors inside it. This would potentially open up a can of worms allowing for `alternatives` with both a `language` and `color-scheme` selector -- I'm not sure it's worth allowing for combinatorial conditions like this, so my preference would be to keep the designs consistent, but separate: `translations / language` and `user-preferences / color-scheme`.

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