[FOLD] Overlay README.md
[WIP] Split TMHello functions out
[FOLD] tidy up names
Peer receive HTTP Upgrade request
[FOLD] TMHello processing
[FOLD] Change Overlay::add and PeerImp::run
[FOLD] More TMHello work
[FOLD] TMHello state machine for server role
[FOLD] close the TMHello handshake loop