[w3c/manifest] Icon shapes and masking (#555)

I've been thinking about how Vanilla Android 7 has largely round icons (or at least some new Google-flavor Android does) and thus icons provided in the manifest, even with the `platform` property will look slightly strange on that OS. 

I heard some developer complain recently that they're not sure how to get the circular shape.

Taking a broader view on this problem, Samsung has their own icon mask shape, Xiaomi have their own icon shape etc.

Thus I wonder if a better solution is to have sites provide their icon as a large square with sufficient padding around the edges and then have the browser apply a mask appropriate for the OS it's running on.

Not sure how that could fit into the spec in terms of `platform` etc. Perhaps we could just use `platform: 'android_maskable'` or something, but wanted to raise it as an idea.

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