Sloved a serious problem in heavily client login-logoff. add a rubbish can, hold sockets to be deleted later

There is still a problem in heavily-test.

const QByteArray & type paras, will cause lift cycle problems. using Value-pass instead.
----
QString, QByteArray supports ref-count and auto-delete , also, these classes support
least-copying, deep-copy will only take place, when the data is about to be changed.
so, in singnals and slots, using QString, QByteArray instead of const QString & and const QByteArray & ,
will not cause performance problem.

It is very strange, that in GNU C++ in Ubuntu, inline-member funcs called by different thread will return zero values.

Start database develop

Change message structure, Add an kick client method for plain client who want to connect to SSL port, or bad client send bad messages

operations in task line. adding event-loop based task thread pool.

1.Add linear hash alg from C code- an dynamic hash method, can effectively hash clients socket and their messages
2.generate several namespaces, avoiding name-conflicts