Add fuctionality to check formats using a validator

[colinpmillar]

This would allow for a format to be specified in, say json schema. This allows the user to very quickly check any input or output formats they have created.

[colinpmillar]

An example of a package for this is:
https://cran.r-project.org/web/packages/jsonvalidate/vignettes/jsonvalidate.html

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "title": "Product",
    "description": "A product from Acme's catalog",
    "type": "object",
    "properties": {
        "id": {
            "description": "The unique identifier for a product",
            "type": "integer"
        },
        "name": {
            "description": "Name of the product",
            "type": "string"
        },
        "price": {
            "type": "number",
            "minimum": 0,
            "exclusiveMinimum": true
        },
        "tags": {
            "type": "array",
            "items": {
                "type": "string"
            },
            "minItems": 1,
            "uniqueItems": true
        }
    },
    "required": ["id", "name", "price"]
}

[nielshintzen]

Incorporate with issue #35
Make use of existing 'formatTacsat' and 'formatEflalo' functions