unused includes (#1133)

* unused includes

Signed-off-by: Rosen Penev <rosenp@gmail.com>

* Use consistent order of includes

Always include in the following order:
- Own header files
- Standard header files
- System header files
- Project header files (toolkit first)

Exceptions:
- cppunit/extensions/HelperMacros.h must be included after
  header files declaring stream operators
- config.h must be included before its definitions are used

---------

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Co-authored-by: Urs Fleisch <ufleisch@users.sourceforge.net>

taglib/audioproperties.h

@@ -26,11 +26,11 @@
 #ifndef TAGLIB_AUDIOPROPERTIES_H
 #define TAGLIB_AUDIOPROPERTIES_H
 
+#include <memory>
+
 #include "taglib.h"
 #include "taglib_export.h"
 
-#include <memory>
-
 namespace TagLib {
 
   //! A simple, abstract interface to common audio properties