rename QtHandles namespace to octave To simplify the codebase, replace QtHandles top-level namespace by octave. Since the header files for the Qt graphics code are not installed, this change shouldn't cause trouble for any external packages so we shouldn't need to provide an alias, even temporarily. Modified files: 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, FigureWindow.cc, FigureWindow.h, GLCanvas.cc, GLCanvas.h, GenericEventNotify.h, KeyMap.cc, KeyMap.h, ListBoxControl.cc, ListBoxControl.h, Logger.cc, Logger.h, Menu.cc, Menu.h, MenuContainer.h, Object.cc, Object.h, ObjectProxy.cc, ObjectProxy.h, Panel.cc, Panel.h, PopupMenuControl.cc, PopupMenuControl.h, PushButtonControl.cc, PushButtonControl.h, PushTool.cc, PushTool.h, QtHandlesUtils.cc, QtHandlesUtils.h, RadioButtonControl.cc, RadioButtonControl.h, SliderControl.cc, SliderControl.h, Table.cc, Table.h, TextControl.cc, TextControl.h, TextEdit.cc, TextEdit.h, ToggleButtonControl.cc, ToggleButtonControl.h, ToggleTool.cc, ToggleTool.h, ToolBar.cc, ToolBar.h, ToolBarButton.cc, ToolBarButton.h, annotation-dialog.cc, qt-graphics-toolkit.cc, qt-graphics-toolkit.h, and graphics-init.cc.

--- a/libgui/graphics/Table.cc	Tue Aug 17 11:17:36 2021 -0400
+++ b/libgui/graphics/Table.cc	Wed Aug 18 00:21:26 2021 -0400
@@ -57,7 +57,7 @@
 #include "oct-string.h"
 #include "oct-strstrm.h"
 
-namespace QtHandles
+namespace octave
 {
 
   static const int AUTO_WIDTH = 75;
@@ -198,7 +198,7 @@
     QString text;
     if (val.is_string ())
       {
-        text = QtHandles::Utils::fromStdString (val.string_value ());
+        text = octave::Utils::fromStdString (val.string_value ());
         flag = Qt::AlignLeft ;
       }
     else if (val.iscomplex ())