All - Enable non-default response modes to be used

[Michael Jones]

Core currently uses MUSTS when describing returning response parameters from the Authorization Endpoint as query encoded or fragment encoded values. Whereas in practice, Google also supports a postMessage response mode and Ping Identity also supports a HTML form POST response. The language should be generalized to allow such alternative bindings.

[Michael Jones]

Fixed #889 - Generalized the descriptions of returning responses from the Authorization Endpoint to enable non-default Response Modes to be used. Fixed #890 - Defined the "form_post" Response Mode.

→ <<cset cf8249e6f08e>>