Change:
7.3. <ins> Within MLS, a ClientInitKey is identified by its hash (see, e.g., welcoming-new-members).  The "key_id" extension allows applications to add an explicit, application-defined identifier to a ClientInitKey. 7.4. </ins> To allow group members to verify that they agree on the public cryptographic state of the group, this section defines a scheme for generating a hash value that represents the contents of the group's

Discussion:
The is no longer needed, since CIKs are referenced by hash. ProposalIDs were no longer usable to refer to proposals since we enabled multiple proposals per MLSPlaintext The syntax description for Welcome was invalid
Merge with master obsoleted some changes. I re-implemented the "supportedversion"->"version" change, and added a "keyid" extension to address Benjamin's comment.
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