xC/xP: show own user's info in frontends

xC-proto

@@ -155,13 +155,25 @@ struct EventMessage {
 
 	case SERVER_UPDATE:
 		string server_name;
-		enum ServerState {
+		union ServerData switch (enum ServerState {
 			DISCONNECTED,
 			CONNECTING,
 			CONNECTED,
 			REGISTERED,
 			DISCONNECTING,
-		} state;
+		} state) {
+		case DISCONNECTED:
+		case CONNECTING:
+		case CONNECTED:
+			void;
+		case REGISTERED:
+			string user;
+			string user_mode;
+		// Theoretically, we could also send user information in this state,
+		// but we'd have to duplicate both fields.
+		case DISCONNECTING:
+			void;
+		} data;
 	case SERVER_RENAME:
 		// Buffers aren't sent updates for in this circumstance,
 		// as that wouldn't be sufficiently atomic anyway.