Draft: add Doxygen strings to the packages' __init__ files

The packages are `draftfunctions`, `draftgeoutils`, `draftguitools`,
`draftmake`, `draftobjects`, `drafttaskpanels`, `drafttests`,
`draftutils`, `draftviewproviders`.

src/Mod/Draft/draftfunctions/__init__.py

@@ -39,3 +39,6 @@ represent the public application programming interface (API)
 of the Draft Workbench, and should be made available in the `Draft`
 namespace by importing them in the `Draft` module.
 """
+## \defgroup draftfuctions draftfuctions
+# \ingroup DRAFT
+# \brief Modules with functions for use with scripted objects and GuiCommands.

src/Mod/Draft/draftgeoutils/__init__.py

@@ -38,3 +38,6 @@ part of the Draft workbench programming interface yet.
 
 These functions were previously defined in the big `DraftGeomUtils` module.
 """
+## \defgroup draftgeoutils draftgeoutils
+# \ingroup DRAFT
+# \brief Functions that are meant to handle different geometrical operations

src/Mod/Draft/draftguitools/__init__.py

@@ -63,3 +63,6 @@ namespaces, so they are accessible at all times.
 These classes can be imported and initialized individually
 but it is easier to set them up just by importing `DraftTools`.
 """
+## \defgroup draftguitools draftguitools
+# \ingroup DRAFT
+# \brief Modules that define the workbench GuiCommands to perform actions.

src/Mod/Draft/draftmake/__init__.py

@@ -80,3 +80,6 @@ can have other properties like `App::PropertyPlacement`,
 or which can interact with the 3D view through Coin,
 can be based on the simple `App::FeaturePython` object.
 """
+## \defgroup draftmake draftmake
+# \ingroup DRAFT
+# \brief Modules with functions to create the custom scripted objects.

src/Mod/Draft/draftobjects/__init__.py

@@ -53,3 +53,6 @@ as the older class.
 
     old_module.Rectangle = new_module.Rectangle
 """
+## \defgroup draftobjects draftobjects
+# \ingroup DRAFT
+# \brief Modules that contain classes that define custom scripted objects.

src/Mod/Draft/drafttaskpanels/__init__.py

@@ -53,3 +53,6 @@ Individual task panel classes and `.ui` files are more maintainable
 because changes can be done to a single tool without affecting the rest,
 and the module size is kept small.
 """
+## \defgroup drafttaskpanels drafttaskpanels
+# \ingroup DRAFT
+# \brief Modules with classes that handle task panels of the GuiCommands.

src/Mod/Draft/drafttests/__init__.py

@@ -39,3 +39,6 @@ on how to write unit tests.
         def test_new_tool(self):
             pass
 """
+## \defgroup drafttests drafttests
+# \ingroup DRAFT
+# \brief Modules that define classes used for unit testing the workbench.

src/Mod/Draft/draftutils/__init__.py

@@ -48,3 +48,6 @@ Initialization modules for the GUI
 - `init_tools`, initialize toolbars and menus of the workbench
 - `init_draft_statusbar`, initialize the status bar of the workbench
 """
+## \defgroup draftutils draftutils
+# \ingroup DRAFT
+# \brief Utility modules that are used throughout the workbench.

src/Mod/Draft/draftviewproviders/__init__.py

@@ -54,3 +54,6 @@ as the older class.
 
     old_module.ViewProviderRectangle = new_module.ViewProviderRectangle
 """
+## \defgroup draftviewproviders draftviewproviders
+# \ingroup DRAFT
+# \brief Classes that define viewproviders for the scripted objects.