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

> The background-color fields in image is interesting but I'm not sure that's what we want here. Maybe we should have background-color on splashscreen? The idea was really about knowing the background colour of the content that would be printed after the generated splash screen.

I need the background color for both the splash screen and for the icons. However, I think I made a mistake having  `background_color` be on the image object. It makes processing non-trivial for me in the gecko implementation. For tiles, this is what I'm doing to determine what image to use:
  
 1. Create an HTML image element in Gecko's parent process. 
 1. convert the list images from `icons` to string of "srcset"s . 
 1. set image.srcset = converted list of icons.
 
In the above, I lose the background color :( That is, I know which `img.currentSrc` is used, but I can't then go back reliably to find which background color was associated with an image object (there could be two sources that use the same background-color).

Would anyone object to removing background color from image object and moving it to it's own members: 

````
"icons_background_color": "papayawhip",
"splashcreen_background_color": "blue" 
```

PS: I hate JSON. It's an inflexible pile of crap. 

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