Replace ContextInterface with callable's
Move message/frame validation back into streamer
Always return frame objects from check
Move close code validation to validator, not base element
onMessage delivers unMaked payload
msg validation moved from Message to MessageValidation
Unify return types
Context return should be input
Remove deprecated Connection
Use strict ContextInterface instead of event emitter
Keep message/frame within connection, not parser
Expect only 1 of specific WebSocket headers
Non-UTF-8 server tests passing :-)
