Adjust WebSocket functionality to use ./config/*.json data

[nneves]

Current WebSocket functionality (socket.io) was set in code with fixed values ([rest.js] ipaddress and tcpport), hooked to the REST API interface (harcoded values).

• Create a REST node to retrieve the WS config data: http://127.0.0.1:9080/api/getwsconfig/

  {"response":{"ipaddress":"192.168.1.109","tcpport":9081,"websockets":true}} .

• Adjust UI javascript code to only use WS if the config property "websockets" is set to TRUE, if not WS should not be initialized and /public/socket.io/socket.io.js should return a blank file instead of the dynamic version provided by the socket.io node module.

[nneves]

Almost completed, initially added a blank file for /public/socket.io/socket.io.js to be used when WS is disabled, but this got cached in the browser and when WS got enabled the dynamic file was not replaced (flatiron from UI [app.js] was already sending the static blank file - need to re-route this request to the REST flatiron instead [rest.js])... removed the static blank file for now, will fix this latter. (so expect it to be missing when WS is disabled)