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/src/main-window.cc	Sun Dec 04 22:56:23 2022 -0500
+++ b/libgui/src/main-window.cc	Sun Dec 04 22:57:02 2022 -0500
@@ -100,7 +100,7 @@
       m_file_browser_window (nullptr),
       m_editor_window (nullptr),
       m_workspace_window (nullptr),
-      m_external_editor (new external_editor_interface (this, m_octave_qobj)),
+      m_external_editor (new external_editor_interface (this)),
       m_active_editor (m_external_editor), m_settings_dlg (nullptr),
       m_find_files_dlg (nullptr), m_set_path_dlg (nullptr),
       m_clipboard (QApplication::clipboard ()),
@@ -118,7 +118,7 @@
         // Before wizard.
         m_octave_qobj.config_translators ();
 
-        welcome_wizard welcomeWizard (m_octave_qobj);
+        welcome_wizard welcomeWizard;
 
         if (welcomeWizard.exec () == QDialog::Rejected)
           exit (1);
@@ -1802,7 +1802,7 @@
     if (m_set_path_dlg)  // m_set_path_dlg is a guarded pointer!
       return;
 
-    m_set_path_dlg = new set_path_dialog (this, m_octave_qobj);
+    m_set_path_dlg = new set_path_dialog (this);
 
     m_set_path_dlg->setModal (false);
     m_set_path_dlg->setAttribute (Qt::WA_DeleteOnClose);
@@ -1838,7 +1838,7 @@
 
     if (! m_find_files_dlg)
       {
-        m_find_files_dlg = new find_files_dialog (this, m_octave_qobj);
+        m_find_files_dlg = new find_files_dialog (this);
 
         connect (m_find_files_dlg, &find_files_dialog::finished,
                  this, &main_window::find_files_finished);