JSON packets instead of encapsulated OSC in websocket feedbacks

[benkuper]

It would be interesting to be able to choose what type of message is sent through the websocket.
Encapsulating OSC and sending through websocket may not be the easiest thing to do for most people implementing it, but JSON through websocket is quite common and would not be too far from what is already set up in the OSCQuery protocol. It could even lead to a REST API so people can even change values through classic HTTP POST Request using the same JSON structure as in the websocket.