[w3c/manifest] (Re-)Add Optional Splash Screens (#501)

This issue proposes resurrecting the `splash_screens` object that was removed with PR #440 

While UAs can fall-back to using one of the smaller images and a background color, offering the optional `splash screens` object gives web app developers an option to have the UA display a larger, more detailed image while their app loads.  

(Example from [prior spec version](http://www.w3.org/TR/2015/WD-appmanifest-20151124/))
```
  "splash_screens": [{
        "src": "splash/lowres",
        "sizes": "320x240"
      }, {
        "src": "splash/hd_small",
        "sizes": "1334x750"
      }, {
        "src": "splash/hd_hi",
        "sizes": "1920x1080",
        "density": 3
      }],

```


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