[Client][Dialog] Rewrite constructor, add(), add field sessionName.
[Client][History] Add function clear().
[Client][ServerListener] Change finalize().
[Server][UserListener] Change finalize().
[Client][Chat] Remove outdated code.
[Server][UserListener] Add redirect main to postman. Change constructor.
[Server][Postman] Add field sessionPool, and work with message. Change constructor.
[Server][Server] Add fields sessionPool, postman. Change creation new UserListener.