Adding code for private chat messages (server side). These messages are not allowed within a game. Adding config option to disable brute force protection.

src/session.h

@@ -80,6 +80,7 @@ public:
 
     void sendGameChatMessage(const std::string &message);
     void sendLobbyChatMessage(const std::string &message);
+	void sendPrivateChatMessage(unsigned targetPlayerId, const std::string &message);
     void kickPlayer(unsigned playerId);
     void kickPlayer(const std::string &playerName);
     void startVoteKickPlayer(unsigned playerId);