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/CommandWindow.cpp

@@ -143,6 +143,7 @@ StdCmdCloseActiveWindow::StdCmdCloseActiveWindow()
     // collide with this shortcut. Thus the shortcut of QMdiSubWindow will be
     // reset in MainWindow::addWindow() (#0002631)
     sAccel        = keySequenceToAccel(QKeySequence::Close);
+    sPixmap       = "Std_CloseActiveWindow";
     eType         = NoTransaction;
 }
 
@@ -170,6 +171,7 @@ StdCmdCloseAllWindows::StdCmdCloseAllWindows()
     sToolTipText  = QT_TR_NOOP("Close all windows");
     sWhatsThis    = "Std_CloseAllWindows";
     sStatusTip    = QT_TR_NOOP("Close all windows");
+    sPixmap       = "Std_CloseAllWindows";
     eType         = NoTransaction;
 }