App Size Reduction: Country flag icons

[mindgraffiti]

Ref. paNNhX-1H-p2

As part of our app size reduction efforts, create an API request to /sites/$site/stats/country-views/. Docs. The response body contains a key, country-info, which links to stylized flag icons and flat icons. The icons are PNG format. Pass the size parameter to scale the PNG.

• [ ] Add API request
• [ ] Extract image download URL
• [ ] Pass the image download URL to the ViewModels
• [ ] Download image
• [ ] Delete the Flags.xcassets folder and files

Example response body

{
   "date":"2020-11-05",
   "days":{
      "2020-11-05":{
         "views":[
            {
               "country_code":"CN",
               "views":1
            }
         ],
         "other_views":0,
         "total_views":1
      }
   },
   "country-info":{
      "CN":{
         "flag_icon":"https:\/\/secure.gravatar.com\/blavatar\/7b8f2d7453c642ac4c6920bd021bf881?s=48",
         "flat_flag_icon":"https:\/\/secure.gravatar.com\/blavatar\/381326b114d5f7264d3207021c3d6437?s=48",
         "country_full":"China",
         "map_region":"030"
      }
   }
}

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[guarani]

Confirmed we still have the 2.1 MB Flags.xcassets and the /sites/{site_id}/stats/country-views endpoint works and returns URLs for the flags, so I think this is a good improvement.