[feature request] WebSocket data decoding

[erdnaxe]

Currently Tulip shows WebSocket streams as TCP streams.
It would be nice to format WebSocket streams like browser developer consoles do.

WebSocket can send packet in text mode or binary mode. For binary mode we could use an alternate representation.

[devgianlu]

On this note, it would be very cool to have a "plugin" system that can further decode the packet (protobuf, msgpack, etc..).