Move multiplex to its own subproject (part 2)
Move multiplex to its own subproject (part 2)

dpospisil/jboss-remoting,stuartwdouglas/jboss-remoting,rhusar/jboss-remoting,seeburger-ag/jboss-remoting,kabir/jboss-remoting,bmaxwell/jboss-remoting