Add SVG icons for ten Std File Menu Commands

This commit adds SVG files with icons for these commands. Also, it makes the necessary changes on CommandDoc.cpp, CommandWindow.cpp, CommandStd.cpp and resource.qrc files.

src/Gui/CommandStd.cpp

@@ -146,6 +146,7 @@ StdCmdRecentFiles::StdCmdRecentFiles()
     sToolTipText  = QT_TR_NOOP("Recent file list");
     sWhatsThis    = "Std_RecentFiles";
     sStatusTip    = QT_TR_NOOP("Recent file list");
+    sPixmap       = "Std_RecentFiles";
     eType         = NoTransaction;
 }