Add ability to set values with symbols ',', ';' in parameterValues block in WorkItemDefinitions json

  [
    "name" : "Rest",
    "parameterValues" : [
        "ConnectTimeout" : "60000",
        "ReadTimeout" : "60000",
        "Method" : "POST,GET",
    ],
    "parameters" : [
        "ContentData" : new StringDataType(),
        "ContentType" : new StringDataType(),
        "Url" : new StringDataType(),
        "Method" : new StringDataType(),
        "ConnectTimeout" : new IntegerDataType(),
        "ReadTimeout" : new IntegerDataType(),
    ],
    "results" : [
        "Result" : new ObjectDataType(),
    ],
    "displayName" : "REST",
    "icon" : "defaultservicenodeicon.png"
  ]

"ContentType": "application/xml;charset=UTF-8,application/json;charset=UTF-8"