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

I'm trying to optimize this from a web developer's standpoint. Here are my criteria:

- The `(prefers-*: foo)` syntax including the required parentheses is familiar for developers and is used in CSS (`@media ()`), JS (`window.matchMedia()`), and HTML (`<link media>`), so try to stick to it.
- The term things vary on is always `media`, so try to use it.
- The concept of a previous default being overridden (like with [`display_override`](https://wicg.github.io/manifest-incubations/#display_override-member)) is a pattern that at least Chromium has used before, so I'm not against calling it `"*_override(s)"` (maybe `user_preference_overrides`).
- Extensibility is key. It started with dark mode, but more user preference media features were added, so having a generic enough property name seems to make sense. 



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