(svn r6612) -Codechange: Use accessors for hidden_state.

Another step toward merging XTDwidget.
The only two files not converted (window.h and widget.c) will be done at the very last commit)

graph_gui.c

@@ -1010,7 +1010,7 @@ static void PerformanceRatingDetailWndProc(Window *w, WindowEvent *e)
 		case WE_CREATE: {
 			int i;
 			Player *p2;
-			w->hidden_state = 0;
+
 			w->disabled_state = 0;
 
 			// Hide the player who are not active