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/fileref.cpp

@@ -32,28 +32,25 @@
 #include <cstring>
 #include <utility>
 
-#include "tdebug.h"
-#include "tfile.h"
 #include "tfilestream.h"
-#include "tstring.h"
-
-#include "asffile.h"
-#include "mpegfile.h"
-#include "vorbisfile.h"
-#include "flacfile.h"
-#include "oggflacfile.h"
-#include "mpcfile.h"
-#include "mp4file.h"
-#include "wavpackfile.h"
-#include "speexfile.h"
-#include "opusfile.h"
-#include "trueaudiofile.h"
+#include "tdebug.h"
 #include "aifffile.h"
-#include "wavfile.h"
 #include "apefile.h"
-#include "modfile.h"
-#include "s3mfile.h"
+#include "asffile.h"
+#include "flacfile.h"
 #include "itfile.h"
+#include "modfile.h"
+#include "mp4file.h"
+#include "mpcfile.h"
+#include "mpegfile.h"
+#include "oggflacfile.h"
+#include "opusfile.h"
+#include "s3mfile.h"
+#include "speexfile.h"
+#include "trueaudiofile.h"
+#include "vorbisfile.h"
+#include "wavfile.h"
+#include "wavpackfile.h"
 #include "xmfile.h"
 
 using namespace TagLib;