eliminate unnecessary uses of octave_qobject in GUI classes * BaseControl.cc, BaseControl.h, ButtonControl.cc, ButtonControl.h, ButtonGroup.cc, ButtonGroup.h, Canvas.cc, Canvas.h, CheckBoxControl.cc, CheckBoxControl.h, Container.cc, Container.h, ContextMenu.cc, ContextMenu.h, EditControl.cc, EditControl.h, Figure.cc, Figure.h, GLCanvas.cc, GLCanvas.h, ListBoxControl.cc, ListBoxControl.h, Menu.cc, Menu.h, Object.cc, Object.h, Panel.cc, Panel.h, PopupMenuControl.cc, PopupMenuControl.h, PushButtonControl.cc, PushButtonControl.h, PushTool.cc, PushTool.h, RadioButtonControl.cc, RadioButtonControl.h, SliderControl.cc, SliderControl.h, Table.cc, Table.h, TextControl.cc, TextControl.h, ToggleButtonControl.cc, ToggleButtonControl.h, ToggleTool.cc, ToggleTool.h, ToolBar.cc, ToolBar.h, ToolBarButton.cc, ToolBarButton.h, annotation-dialog.cc, annotation-dialog.h, qt-graphics-toolkit.cc, qt-graphics-toolkit.h, command-widget.h, community-news.cc, community-news.h, documentation-bookmarks.cc, documentation-bookmarks.h, documentation.cc, external-editor-interface.cc, external-editor-interface.h, find-files-dialog.cc, find-files-dialog.h, graphics-init.cc, graphics-init.h, interpreter-qobject.cc, file-editor.cc, find-dialog.cc, find-dialog.h, main-window.cc, main-window.h, news-reader.cc, news-reader.h, octave-qobject.cc, release-notes.cc, resource-manager.cc, set-path-dialog.cc, set-path-dialog.h, shortcut-manager.cc, shortcut-manager.h, welcome-wizard.cc, welcome-wizard.h, workspace-model.cc: Don't store references to octave_qobject in GUI classes where it is no longer needed. Eliminate unnecessary octave_qobject constructor arguments. Change all uses.

--- a/libgui/graphics/Figure.cc	Sun Dec 04 22:56:23 2022 -0500
+++ b/libgui/graphics/Figure.cc	Sun Dec 04 22:57:02 2022 -0500
@@ -110,19 +110,19 @@
   }
 
   Figure *
-  Figure::create (octave::base_qobject& oct_qobj, octave::interpreter& interp,
+  Figure::create (octave::interpreter& interp,
                   const graphics_object& go)
   {
-    return new Figure (oct_qobj, interp, go, new FigureWindow ());
+    return new Figure (interp, go, new FigureWindow ());
   }
 
-  Figure::Figure (octave::base_qobject& oct_qobj, octave::interpreter& interp,
+  Figure::Figure (octave::interpreter& interp,
                   const graphics_object& go, FigureWindow *win)
-    : Object (oct_qobj, interp, go, win), m_blockUpdates (false),
+    : Object (interp, go, win), m_blockUpdates (false),
       m_figureToolBar (nullptr), m_menuBar (nullptr), m_innerRect (),
       m_outerRect (), m_previousHeight (0), m_resizable (true)
   {
-    m_container = new Container (win, oct_qobj, interp);
+    m_container = new Container (win, interp);
     win->setCentralWidget (m_container);
 
     connect (m_container, QOverload<const octave::fcn_callback&>::of (&Container::interpreter_event),