fix include style relating to cplusplus libraries

... and adjust INCLUDEPATH accordingly.

while i'm at messing with include statements, also re-order the include
blocks according to policy and sort them within bigger blocks.

Change-Id: I7762abfd7c4ecf59432b99db2f424e4fa25733a5
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/cpptools/cppcodestylesettingspage.h

@@ -31,17 +31,17 @@
 #define CPPCODESTYLESETTINGSPAGE_H
 
 #include "cpptools_global.h"
+#include "cppcodestylesettings.h"
+#include "cppcodeformatter.h"
 
 #include <coreplugin/dialogs/ioptionspage.h>
+
 #include <QWidget>
 #include <QPointer>
 #include <QSharedPointer>
 #include <QVariant>
 #include <QStringList>
 
-#include "cppcodestylesettings.h"
-#include "cppcodeformatter.h"
-
 namespace TextEditor {
     class FontSettings;
     class TabSettings;