Move All Shadow Specs To Shadows Folder

TBD - leave related parts of shadow specs if it is necessary for that spec only. e.g. below spec doesn't need to be in a separate section, and does not require to include the whole shadow

Concepts Shadow

For following concepts definition, quantifier of service doesn't have a max;

CONCEPTS: service.concepts.json

{
    "$service+": {
        "$parameter?": "$type"
    }
}

CONCEPTS SHADOW

{
    "concept": {
        "_": "service", 
        "quantifier": { "min": 1 },
        "concept": {
            "_": "parameter",
            "quantifier": { "min": 0, "max": 1 },
            "variable": {
                "_": "type"
            }
        }
    }
}

Leave only this part in that spec;

{
  "concept": {
      ...
      "quantifier": { "min": 1 }
      ...
  }
}