message: add alertIcon imageField
diff: "resolutionWidth": 35,
  "resolutionHeight": 35
  }
  + },
  + {
  + "name": "alertIcon",
  + "imageResolution": {
  + "resolutionWidth": 225,
  + "resolutionHeight": 225
  + }
  }
  ],
  "imageCapabilities": [
  "DYNAMIC",
  "STATIC"
  - ],
  - "menuLayoutsAvailable": [
  - "LIST",
  - "TILES"
  ]
  },
  "audioPassThruCapabilities": {
  