Metadata.json file should be split

[MrAmericanMike]

I believe it would be better if we could split the metadata.json file into 2 separate files. One that is generated after svg files are added to the directories and another file where we can name each region / sub region.

For example:

{
        "code": "tx",
        "sub_regions": [
          {
            "code": "benbrook",
            "aspect_ratio": 1.4962593516209477
          },
........
        ],
        "aspect_ratio": 1.5
      },

As we can see doesn't mention "Texas" anywhere. So we would need another file with

{
"code": "us",
"name": "United States of America",
"regions": [
	{
		"code": "tx",
		"name": "Texas"
	}
]
}