Add "Show in File System View" to more menus

And add a shortcut for editor manager for that, similar to "Show in
Finder/Explorer" and "Open Terminal Here".

Change-Id: Iddc287106e194c856501bf38e53b3c738a2aed1a
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/coreplugin/coreconstants.h

@@ -135,6 +135,7 @@ const char ABOUT_QTCREATOR[]       = "QtCreator.AboutQtCreator";
 const char ABOUT_PLUGINS[]         = "QtCreator.AboutPlugins";
 const char S_RETURNTOEDITOR[]      = "QtCreator.ReturnToEditor";
 const char SHOWINGRAPHICALSHELL[]  = "QtCreator.ShowInGraphicalShell";
+const char SHOWINFILESYSTEMVIEW[]  = "QtCreator.ShowInFileSystemView";
 
 const char OUTPUTPANE_CLEAR[] = "Coreplugin.OutputPane.clear";