App: modernize C++: replace 'typedef' with 'using'

src/App/PropertyLinks.cpp

@@ -2519,14 +2519,14 @@ bool PropertyLinkSubList::adjustLink(const std::set<App::DocumentObject*> &inLis
 // has now been changed to simply use the absoluteFilePath(), and rely on user
 // to be aware of possible duplicated file location. The reason being that
 // some user (especially Linux user) use symlink to organize file tree.
-typedef std::map<QString,DocInfoPtr> DocInfoMap;
+using DocInfoMap = std::map<QString, DocInfoPtr>;
 DocInfoMap _DocInfoMap;
 
 class App::DocInfo :
     public std::enable_shared_from_this<App::DocInfo>
 {
 public:
-    typedef boost::signals2::scoped_connection Connection;
+    using Connection = boost::signals2::scoped_connection;
     Connection connFinishRestoreDocument;
     Connection connPendingReloadDocument;
     Connection connDeleteDocument;