Support breakpoints when starting unit tests from visual studio.
Fixed close message from server to client.
Support partially received headers on server and client side.
Fixed reset of FrameHeader.IsEnd.
Fixed client disconnect (make it ready for next connect).
Fixed WebSocketServer.Clients (count).
Fixed and improved integration test ClientSendDataConcurrent.
Added integration test ClientSendMultipleMessages.
Improved TCPServer: Use asynchronous BeginAcceptTcpClient instead of looping in a threadpool thread.