* Move config, setup, mscs into "setup" top-level folder * oops, forgot the EDU server * Add setup * goimports
Initial implementation of MSC2753, as tested by https://github.com/matrix-org/sytest/pull/944. Doesn't yet handle unpeeks, peeked EDUs, or history viz changing during a peek - these will follow. https://github.com/matrix-org/dendrite/pull/1370 has full details.