cleanup
added the server's client map
added mbs_server_add_watch()
set client socket in non-blocking mode
handled client EOF
added the MBWatch type
fixed MbcClient
fixed MbcClient
added the MbalApp class
added the MbcApp class
fixed MbalApp base class
moved the client object to MbcApp
added the MbMessageWriter class
added the MbMessageReader class