OAS 3.2.0 parameter and header features

[mattpolzin]

Parameter and header changes

• Additional parameter location querystring, to allow parsing the entire query string as a single field similar to the way a request body is handled, using the content field.
• Parameters can therefore be in the querystring as an alternative to the existing header, cookie, query and path values.
• allowReserved field is now permitted on headers and on parameters with any value of in, and applies where the combination of in and style automatically percent-encode the value.