Daniel Martí authored Jun 22, 2020 and p4u committed Jun 23, 2020

First, make the types use json.RawMessage for the signed payloads. This
ensures we can actually sign and verify the same json []byte that is
sent over the websocket connection.

Second, thanks to the simplification above, we no longer need to use
crypto functions which deal with JSON; we only use []byte now.

Third, update all the server code (router and census) and client code,
mainly under the client package.

Fourth, deduplicate the client code; cmd/testclient and test/testcommon
now both use the client package directly.