Draft: add modules of draftviewproviders to the proper Doxygen group

This includes `view_array`, `view_base`, `view_bezcurve`,
`view_bspline`, `view_circulararray`, `view_clone`, `view_dimension`,
`view_draft_annotation`, `view_draftlink`, `view_facebinder`,
`view_fillet`, `view_label`, `view_orthoarray`, `view_point`,
`view_polararray`, `view_rectangle`, `view_text`, `view_wire`,
`view_wpproxy`.

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

src/Mod/Draft/draftviewproviders/view_rectangle.py

@@ -20,12 +20,13 @@
 # *   USA                                                                   *
 # *                                                                         *
 # ***************************************************************************
-"""This module provides the view provider code for the Draft Rectangle object.
-"""
+"""Provides the viewprovider code for the Rectangle object."""
 ## @package view_rectangle
-# \ingroup DRAFT
-# \brief This module provides the view provider code for the Draft Rectangle object.
+# \ingroup draftviewproviders
+# \brief Provides the viewprovider code for the Rectangle object.
 
+## \addtogroup draftviewproviders
+# @{
 from PySide.QtCore import QT_TRANSLATE_NOOP
 
 from draftviewproviders.view_base import ViewProviderDraft
@@ -41,4 +42,7 @@ class ViewProviderRectangle(ViewProviderDraft):
                          "Draft", QT_TRANSLATE_NOOP("App::Property", _tip))
 
 
+# Alias for compatibility with v0.18 and earlier
 _ViewProviderRectangle = ViewProviderRectangle
+
+## @}