Import clippings - support Text Snippets JSON format

[aecreations]

There was a recent request in the forums[1] to be able to import data from the Text Snippets add-on for Google Chrome[2].

Add the ability to detect the Text Snippets JSON format and import the data. Sample pretty-printed JSON data:

[
  {
    "id": "64",
    "type": "text",
    "level": "0",
    "parent": "0",
    "name": "Example Snippet",
    "text":" "This is the content of the snippet",
    "html":"false"
  },
  // ...
]

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Notes:
[1] https://groups.google.com/g/aecreations-help/c/39Ih3gMROJs
[2] https://chrome.google.com/webstore/detail/text-snippets/jggnilkehdabmihebipcodnnjoepllao?hl=en