OWX_SER: implement DevIo-based communication and reconnect

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@6271 2b470e98-0d58-463d-a4d8-8e2adae1ed80
OWX_FRM: fix command 'delete'

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@6272 2b470e98-0d58-463d-a4d8-8e2adae1ed80
OWX_ASYNC_Disconnect: stop all Client-timers on disconnect

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@6273 2b470e98-0d58-463d-a4d8-8e2adae1ed80