* Allow text/plain content type descriptor for json formatted content body. Refactored duplicated encode/decode functions for rest api
* Fix relay endpoint decodings of content bodies to accept text/plain
* Added support for content body decoder for checking media type if additional parameters are present
* Fix wrong usage of ContentTypeData - appeared only for tests
/admin rest api implementation and tests
* open api doc
* Add rest admin test to all tests
* Enrich /admin get peers interface, group protocols by peers in response
