Draft: add modules of draftguitools to the proper Doxygen group

This includes `gui_annotationstyleeditor`, `gui_arcs`, `gui_array_simple`,
`gui_arrays`, `gui_base`, `gui_base_original`, `gui_beziers`,
`gui_circles`, `gui_circulararray`, `gui_clone`, `gui_circulararray`,
`gui_clone`, `gui_dimension_ops`, `gui_dimensions`, `gui_downgrade`,
`gui_draft2sketch`, `gui_drawing`, `gui_edit`, `gui_edit_arch_objects`,
`gui_edit_draft_objects`, `gui_edit_part_objects`, `gui_edit_sketcher_objects`,
`gui_ellipses`, `gui_facebinders`, `gui_fillets`, `gui_grid`,
`gui_groups`, `gui_heal`, `gui_join`, `gui_labels`, `gui_line_add_delete`,
`gui_lineops`, `gui_lines`, `gui_lineslope`, `gui_mirror`,
`gui_move`, `gui_offset`, `gui_orthoarray`, `gui_patharray`,
`gui_planeproxy`, `gui_pointarray`, `gui_points`, `gui_polararray`,
`gui_polygons`, `gui_rectangles`, `gui_rotate`, `gui_scale`,
`gui_selectplane`, `gui_shape2dview`, `gui_shapestrings`, `gui_snapper`,
`gui_snaps`, `gui_splines`, `gui_split`, `gui_stretch`, `gui_styles`,
`gui_subeleemnts`, `gui_texts`, `gui_togglemodes`, `gui_tools_utils`,
`gui_trackers`, `gui_trimex`, `gui_upgrade`, `gui_wire2spline`.

These are added to the `draftguitools` Doxygen group
so that the functions and classes contained in each module
are listed appropriately in the automatically generated
documentation.

src/Mod/Draft/draftguitools/gui_offset.py

@@ -22,15 +22,17 @@
 # *   USA                                                                   *
 # *                                                                         *
 # ***************************************************************************
-"""Provides tools for offsetting objects with the Draft Workbench.
+"""Provides GUI tools to create offsets from objects.
 
 It mostly works on lines, polylines, and similar objects with
 regular geometrical shapes, like rectangles.
 """
 ## @package gui_offset
-# \ingroup DRAFT
-# \brief Provides tools for offsetting objects with the Draft Workbench.
+# \ingroup draftguitools
+# \brief Provides GUI tools to create offsets from objects.
 
+## \addtogroup draftguitools
+# @{
 import math
 from PySide.QtCore import QT_TRANSLATE_NOOP
 
@@ -42,6 +44,7 @@ import draftutils.utils as utils
 import draftguitools.gui_base_original as gui_base_original
 import draftguitools.gui_tool_utils as gui_tool_utils
 import draftguitools.gui_trackers as trackers
+
 from draftutils.messages import _msg, _wrn, _err
 from draftutils.translate import translate, _tr
 
@@ -315,3 +318,5 @@ class Offset(gui_base_original.Modifier):
 
 
 Gui.addCommand('Draft_Offset', Offset())
+
+## @}