[Wd] Add shortcut "Select all elements"

The problem existed in all versions up to and including the 50th.
The Ctrl+A shortcut works in WD, but this shortcut is not in the menu.

1. Open the WD ("Run or Create Workflow" on the "Start Page").
   The "Choose Output Directory" dialog may appear. Set any directory and click "OK".
   Finally the WD window appeared.
2. Open any samples. For example, double-click "Samples"- >"Alignment"->"Align sequences with MUSCLE".
   The "Align Sequences with MUSCLE Wizard" appears.
3. Close the wizard.
   The WD window appears.
4. Set focus to the WD by clicking on an empty space in the Scene.
5. Press Ctrl+A (⌘+A).
   All elements on the Scene have a dashed frame, which means they are selected.
6. Deselect all elements (click on an empty space in the Scene).
7. Right-click anywhere in the Scene.
   A context menu appears. There is an option with the text "Select all elements".
   Expected state: the option has a Ctrl+A (⌘+A) shortcut.
   Current state: the option doesn't have a shortcut, unlike, for example, "Paste Ctrl+V".
8. Click "Select all elements".
   All elements are selected again, as if the Ctrl+A (⌘+A) had been pressed.
9. The same for the Main Menu- >"Actions"->"Select all elements" option.