ConnectToDialog: QPushButton is a system header
ConnectToDialog: do not toLower() to protocol()
ConnectToDialog: modify tab order
ConnectToDialog: add getters for transferMode and encoding
Introduce ServerInfo class
Implement AddressBook features
ConnectToDialog: ask for a user to input name and host field
AddressBookDialog: set a window title properly

as well as a title of ConnnectTo dialog
AddressBookDialog: use windowTitle() as a message box title