Report export functionality

[thushan]

Long overdue report export functionality for the ASV club dedupe run.

  "_meta": {
    "config": {
    ...
    },
    "version": "v0.0.x",
    "commit": "xyz",
    "host": "???",
    "user": "???",
    "timestamp": "???"
  },
  "analysis": {
    "fails": [],
    "empty": [],
    "dupes": [],
  },
  "summary": {
    "top": [
      { "hash": "xyz", "size": 1234}
    ],
    "duplicateFileSize": 12345,
    "totalFiles": 123,
    "totalFileFails": 123,
    "elapsedTime": 123,
    "uniqueFiles": 123,
    "emptyFiles": 123,
    "duplicateFiles": 123
}

Duplicates are simpler representations:

"duplicates": [
          {
            "filename": "_DSC0965.JPG",
            "location": "H:\\Photos",
            "fullName": "H:\\Photos\\Profile\\Newester\\_DSC0965.JPG",
            "path": "Profile\\Newester",
            "hash": "aec269b79377b969",
            "size": 5537792,
            "fullHash": false
          },
          {
            "filename": "_DSC0965.JPG",
            "location": "H:\\Photos",
            "fullName": "H:\\Photos\\_sort\\_DSC0965.JPG",
            "path": "_sort",
            "hash": "aec269b79377b969",
            "size": 5537792,
            "fullHash": false
          }
        ],
        "filename": "_DSC0965.JPG",
        "location": "H:\\Photos",
        "fullName": "H:\\Photos\\Profile\\Newester\\_DSC0965.JPG",
        "path": "Profile\\Newester",
        "hash": "aec269b79377b969",
        "size": 5537792,
        "fullHash": false
      }
]