Include wx/settings.h according to precompiled headers of wx/wx.h (with other minor cleaning).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39310 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/xrc/xmlres.cpp

@@ -25,6 +25,7 @@
     #include "wx/panel.h"
     #include "wx/frame.h"
     #include "wx/dialog.h"
+    #include "wx/settings.h"
 #endif
 
 #ifndef __WXWINCE__
@@ -41,7 +42,6 @@
 #include "wx/image.h"
 #include "wx/fontmap.h"
 #include "wx/artprov.h"
-#include "wx/settings.h"
 
 #include "wx/xml/xml.h"