[w3c/manifest] Add a `color_scheme` member to `ImageResource` (#758)

With operating systems beginning to offer multiple color schemes (e.g., “dark mode” and “light mode”) and with CSS offering a media query for that user preference, it is important to enable web apps to offer appropriate iconography for the context. As such, we need to upgrade the ImageResource dictionary to include an optional member indicating which color scheme a given image should be associated with.

I’ve worked up an explainer on this here: https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/master/ImageResource-color_scheme/explainer.md


Related: #618 

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