fixed changing status and added actual conn. status in statusBar
added system tray icon
fixed problem with add conversation to chatbox when is minimalized

Example:
When double clicked in you buddy in contact list, if before chatbox
is minimalized, add new tab (or check is opened) and show chatbox.
added: when chatbox will be closed, all tabs will also be closed
added: when close/minimalize button hint to minimalize app to tray