Studio now enables parsing parameters as JSON objects

When using the Set Variables widget and Run Subflow widget, parameters are (by default) parsed as strings. Use the `parse as JSON object` option when you know a parameter will be a JSON object. This will allow the variable to be properly interpreted as a JSON object so you can reference its attributes within the Studio flow. 

The `parse as JSON object` option allows you to:

• Set or pass an existing JSON object and reference its members as variables.

• Set a literal JSON string (Liquid reference to a JSON string, or a mixture of JSON and Liquid) and access it as an object.