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/Object.cc	Sun Dec 04 22:56:23 2022 -0500
+++ b/libgui/graphics/Object.cc	Sun Dec 04 22:57:02 2022 -0500
@@ -32,7 +32,6 @@
 
 #include "Object.h"
 #include "QtHandlesUtils.h"
-#include "octave-qobject.h"
 #include "qt-graphics-toolkit.h"
 
 #include "graphics.h"
@@ -41,10 +40,10 @@
 namespace octave
 {
 
-  Object::Object (octave::base_qobject& oct_qobj, octave::interpreter& interp,
+  Object::Object (octave::interpreter& interp,
                   const graphics_object& go, QObject *obj)
-    : QObject (), m_octave_qobj (oct_qobj), m_interpreter (interp),
-      m_go (go), m_handle (go.get_handle ()), m_qobject (nullptr)
+    : QObject (), m_interpreter (interp), m_go (go),
+      m_handle (go.get_handle ()), m_qobject (nullptr)
   {
     gh_manager& gh_mgr = m_interpreter.get_gh_manager ();