draft-ietf-oauth-v2-1-12

Changes

• Added DPoP and Step-Up Auth to appendix of extensions
• Updated reference for case insensitivity of auth scheme to HTTP instead of ABNF (#186)
• Corrected an instance of "relying party" vs "client" (#169)
• Moved client_id requirement to the individual grant types
• Updated language around client registration to better reflect alternative registration methods such as those in use by OpenID Federation and open ecosystems
• fixed typos #185
• consolidated description of serialization #181 #190