* Remove produces/consumes setter from OperationContainer
* Store consumes/produces information in `meta` key
* Migrate produces value state usage to `meta` key
* use meta consumes data for isXml check
* Fix failing tests
* normalize action name casing
* restore correct produces fallback value logic
- Display mutated requests from request interceptor in curl output in UI.
Put this behind showMutatedRequest flag so that the mutation can be
silent.
- Document requestInterceptor, responseInterceptor and showMutatedRequest
in README.md
- Add tests