Utils: Modernize further

Many issues, mostly in headers, were not addressed in
e38410b76c

modernize-use-auto
modernize-use-nullptr
modernize-use-override
modernize-use-using
modernize-use-default-member-init
modernize-use-equals-default

Change-Id: I320a51726db881e582b898948d53735ebb06887a
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/savefile.cpp

@@ -39,7 +39,7 @@ namespace Utils {
 QFile::Permissions SaveFile::m_umask = nullptr;
 
 SaveFile::SaveFile(const QString &filename) :
-    m_finalFileName(filename), m_finalized(true)
+    m_finalFileName(filename)
 {
 }