libtorc-core: Improved TorcWebSocket connection logging
libtorc-core: Consisten thread naming for TorcWebSocket
libtorc-core: Suppress erroneous lof message for parameter-less RPCs
libtorc-core: Remove support for WebSocket subprotocols other than JSON-

- I currently can't see the point of non JSON-RPC serialisations, as
everything from browsers to iOS should have native JSON support now.