data: forward declaration for storageAccessProxy in FileManager

<description>

src/lib/utility/file/FileManager.cpp

@@ -5,6 +5,7 @@
 
 #include "utility/file/FileSystem.h"
 #include "utility/utility.h"
+#include "data/access/StorageAccessProxy.h"
 
 FileManager::FileManager(StorageAccessProxy* storageAccessProxy)
 	: m_storageAccessProxy(storageAccessProxy)

src/lib/utility/file/FileManager.h

@@ -5,9 +5,10 @@
 #include <set>
 #include <vector>
 
-#include "data/access/StorageAccessProxy.h"
 #include "utility/file/FileInfo.h"
 
+class StorageAccessProxy;
+
 class FileManager
 {
 public: