- added new notifier to p3ChatService
GUI:
- list all public and private chat lobbies
- added subscribe/unsubscribe
- added new basic widget ChatTabWidget and use it in PopupChatWindow and ChatLobbyDialog
- added a tabbed dialog for every subscribed chat lobby
git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@4782 b45a01b8-16f6-495d-af2f-9b41ad6348cc