Wholesale conversion to #pragma once

Kudos to cgmb and https://github.com/cgmb/guardonce

Change-Id: Ifa8970734b8d43fd08c9260c645bdb0228633791
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/qmlprojectmanager/fileformat/filefilteritems.h

@@ -23,8 +23,7 @@
 **
 ****************************************************************************/
 
-#ifndef FILEFILTERITEMS_H
-#define FILEFILTERITEMS_H
+#pragma once
 
 #include "qmlprojectitem.h"
 
@@ -172,5 +171,3 @@ public:
 };
 
 } // namespace QmlProjectManager
-
-#endif // FILEFILTERITEMS_HPROJECTITEM_H

src/plugins/qmlprojectmanager/fileformat/qmlprojectfileformat.h

@@ -23,8 +23,7 @@
 **
 ****************************************************************************/
 
-#ifndef QMLPROJECTFILEFORMAT_H
-#define QMLPROJECTFILEFORMAT_H
+#pragma once
 
 #include <utils/fileutils.h>
 
@@ -44,5 +43,3 @@ public:
 };
 
 } // namespace QmlProjectManager
-
-#endif // QMLPROJECTFILEFORMAT_H

src/plugins/qmlprojectmanager/fileformat/qmlprojectitem.h

@@ -23,8 +23,7 @@
 **
 ****************************************************************************/
 
-#ifndef QMLPROJECTITEM_H
-#define QMLPROJECTITEM_H
+#pragma once
 
 #include <QObject>
 #include <QSet>
@@ -80,5 +79,3 @@ protected:
 };
 
 } // namespace QmlProjectManager
-
-#endif // QMLPROJECTITEM_H