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Add `$ref` resolving for array elements

References can be included in array elements,
for example in the case of parameters:

```json
"paths": {
  "/pets": {
    "get": {
      "summary": "List all pets",
      "operationId": "listPets",
      "tags": [
        "pets"
      ],
      "parameters": [
        {
          "$ref": "partial/Parameter_1.json"
        }
...
```

This commit adds the logic for handling $ref elements in arrays.

Part of #184

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