multiframe web socket messages are supported

Signed-off-by: Vladyslav Oleniuk <vlad.oleniuk@gmail.com>
web-socket messages chunking is added
multiframe web socket messages are supported

Signed-off-by: Vladyslav Oleniuk <vlad.oleniuk@gmail.com>
Merge branch 'multiframe-websocket-messages' into v2.1.2-kiwigrid
Encoding while sending text as binary is fixed