Re: [manifest] Manifest format should support some way of including a splash screen (#9)

How about having `background_color` on icon and `icon_background_color`. That would allow authors to override `icons_background_color`. 

```JSON
{
"icons": [
   {"src": "icon.png", background_color: "orange" },
   {"src": "icon.png"}
]
"icons_background_color": "red"
}
```

I also seriously want to introduce `platform` and `theme` on image objects too - to address @pornel's use cases from #361. 

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