Resolve "Update ewoks types"

Closes #35 (closed)

Update types to support roles and validity_days. Example:

 "keywords": {
            "cardinality": "1",
            "definition": "*",
            "instrumentName": "ID23-1",
            "scanType": ["datacollection", "integration"],
            "roles": ["instrumentScientist", "manager"],
            "validity_days" :  90
        },

and defaults:

"high_res_limit": {
                    "title": "High resolution limit (prepo)",
                    "type": "number",
                    "default": [
                        {
                            "type": "parameter",
                            "value": "MXAutoprocIntegrationScaling_overall_resolution_limit_high"
                        },
                         {
                            "type": "parameter",
                            "value": "MXAutoprocIntegrationScaling_fallback_in_case-previous_does_not_exist"
                        }
                    ]
                },