Move ToString.h to the proper location

and fix make distcheck

Makefile.am

@@ -139,6 +139,7 @@ noinst_HEADERS = \
 	src/utils/ModificationsNotifier.h \
 	src/utils/SWMRLock.h \
 	src/utils/VLCInstance.h \
+	src/utils/ToString.h \
 	src/VideoTrack.h \
 	src/compat/Thread.h \
 	$(NULL)

src/History.cpp

@@ -23,7 +23,7 @@
 #include "History.h"
 
 #include "database/SqliteTools.h"
-#include "ToString.h"
+#include "utils/ToString.h"
 
 namespace medialibrary
 {

src/database/SqliteErrors.h

@@ -24,7 +24,7 @@
 
 #include <string>
 #include <exception>
-#include "ToString.h"
+#include "utils/ToString.h"
 
 namespace medialibrary
 {

src/metadata_services/MetadataParser.cpp

@@ -28,7 +28,7 @@
 #include "Genre.h"
 #include "Media.h"
 #include "Show.h"
-#include "ToString.h"
+#include "utils/ToString.h"
 #include "utils/Filename.h"
 #include "utils/ModificationsNotifier.h"
 #include <cstdlib>

src/metadata_services/vlc/VLCThumbnailer.cpp

@@ -31,7 +31,7 @@
 #include "logging/Logger.h"
 #include "MediaLibrary.h"
 #include "utils/VLCInstance.h"
-#include "ToString.h"
+#include "utils/ToString.h"
 
 #ifdef HAVE_JPEG
 #include "imagecompressors/JpegCompressor.h"