kconfig/lxdialog: refactor color support

Clean up and refactor color support. All color support are now
in util.c including color definitions.
In the process introduced a global variable named 'dlg' which is
used all over to set color - thats the reason why all files are changed.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/kconfig/lxdialog/msgbox.c b/scripts/kconfig/lxdialog/msgbox.c
index 7323f54..236759f 100644
--- a/scripts/kconfig/lxdialog/msgbox.c
+++ b/scripts/kconfig/lxdialog/msgbox.c
@@ -40,19 +40,20 @@
 	dialog = newwin(height, width, y, x);
 	keypad(dialog, TRUE);
 
-	draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
+	draw_box(dialog, 0, 0, height, width,
+		 dlg.dialog.atr, dlg.border.atr);
 
 	print_title(dialog, title, width);
 
-	wattrset(dialog, dialog_attr);
+	wattrset(dialog, dlg.dialog.atr);
 	print_autowrap(dialog, prompt, width - 2, 1, 2);
 
 	if (pause) {
-		wattrset(dialog, border_attr);
+		wattrset(dialog, dlg.border.atr);
 		mvwaddch(dialog, height - 3, 0, ACS_LTEE);
 		for (i = 0; i < width - 2; i++)
 			waddch(dialog, ACS_HLINE);
-		wattrset(dialog, dialog_attr);
+		wattrset(dialog, dlg.dialog.atr);
 		waddch(dialog, ACS_RTEE);
 
 		print_button(dialog, "  Ok  ", height - 2, width / 2 - 4, TRUE);