Draft: clean up gui_arrays and gui_base

Small spacing fixes like imports in separate lines
for more clarity, the module docstring,
and the position of the license.

Remove unused imports. And use proper `ToDo` class
instead of importing `DraftGui`.

src/Mod/Draft/draftguitools/gui_arrays.py

@@ -1,8 +1,3 @@
-"""Provide the Draft ArrayTools command to group the other array tools."""
-## @package gui_arrays
-# \ingroup DRAFT
-# \brief Provide the Draft ArrayTools command to group the other array tools.
-
 # ***************************************************************************
 # *   (c) 2020 Eliud Cabrera Castillo <e.cabrera-castillo@tum.de>           *
 # *                                                                         *
@@ -25,9 +20,14 @@
 # *   USA                                                                   *
 # *                                                                         *
 # ***************************************************************************
+"""Provide the Draft ArrayTools command to group the other array tools."""
+## @package gui_arrays
+# \ingroup DRAFT
+# \brief Provide the Draft ArrayTools command to group the other array tools.
+from PySide.QtCore import QT_TRANSLATE_NOOP
+
 import FreeCAD as App
 import FreeCADGui as Gui
-from PySide.QtCore import QT_TRANSLATE_NOOP
 
 
 class ArrayGroupCommand:
@@ -49,8 +49,11 @@ def GetResources(self):
                 'ToolTip': QT_TRANSLATE_NOOP("Arch", _tooltip)}
 
     def IsActive(self):
-        """Be active only when a document is active."""
-        return App.ActiveDocument is not None
+        """Return True when this command should be available."""
+        if App.ActiveDocument:
+            return True
+        else:
+            return False
 
 
 Gui.addCommand('Draft_ArrayTools', ArrayGroupCommand())

src/Mod/Draft/draftguitools/gui_base.py

@@ -1,9 +1,3 @@
-"""This module provides the Base object for all Draft Gui commands.
-"""
-## @package gui_base
-# \ingroup DRAFT
-# \brief This module provides the Base object for all Draft Gui commands.
-
 # ***************************************************************************
 # *   (c) 2009 Yorik van Havre <yorik@uncreated.net>                        *
 # *   (c) 2010 Ken Cline <cline@frii.com>                                   *
@@ -28,10 +22,14 @@
 # *   USA                                                                   *
 # *                                                                         *
 # ***************************************************************************
+"""Provide the Base object for all Draft Gui commands."""
+## @package gui_base
+# \ingroup DRAFT
+# \brief This module provides the Base object for all Draft Gui commands.
 
 import FreeCAD as App
 import FreeCADGui as Gui
-import DraftGui
+import draftutils.todo as todo
 
 
 class GuiCommandBase:
@@ -52,7 +50,7 @@ class GuiCommandBase:
 
         Each string in the list of strings represents a Python instruction
         which will be executed in a delayed fashion
-        by `DraftGui.todo.delayCommit()`
+        by `todo.ToDo.delayCommit()`
         ::
             list1 = ["a = FreeCAD.Vector()",
                      "pl = FreeCAD.Placement()",
@@ -69,6 +67,7 @@ class GuiCommandBase:
             >>> pl = FreeCAD.Placement()
             >>> Draft.autogroup(obj)
     """
+
     def __init__(self):
         self.call = None
         self.commit_list = []
@@ -78,7 +77,8 @@ def __init__(self):
         self.planetrack = None
 
     def IsActive(self):
-        if Gui.ActiveDocument:
+        """Return True when this command should be available."""
+        if App.ActiveDocument:
             return True
         else:
             return False
@@ -102,7 +102,7 @@ def finish(self):
                 pass
             self.call = None
         if self.commit_list:
-            DraftGui.todo.delayCommit(self.commit_list)
+            todo.ToDo.delayCommit(self.commit_list)
         self.commit_list = []
 
     def commit(self, name, func):