Re: [w3c/manifest] More precise control over app window features (#856)

I'm in favour of the `display_modifers` proposal as a sibling to the `display` field.

I think it's inevitable that we will need to make room for more precise control over these modifiers. To future proof this each display modifier should be able to accept either a bool or a bag of further customisations e.g.
```json
{
  "display": "standalone",
  "display_modifiers": {
    "tabs": true
  }
}
```
or
```json
{
  "display": "standalone",
  "display_modifiers": {
    "tabs": {
      "active_color": "white",
      "inactive_color": "transparent"
    }
  }
}
```

`"tabs": true` and `"tabs": {}` are behaviourally equivalent; all sub customisations are decided by the user agent.

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