Draft: move AddPoint and DelPoint to gui_line_add_delete module

These two Gui Commands were inside `DraftTools.py`
but they were considered obsolete as they just call `Draft_Edit`.
They were completely removed in 8f07732c46 and 15de58a5be.

They are restored in this commit and placed in their own module
just for historical reasons; however this module is not imported
in `DraftTools.py`.

src/Mod/Draft/draftguitools/gui_line_add_delete.py

@@ -0,0 +1,109 @@
+# ***************************************************************************
+# *   (c) 2009, 2010 Yorik van Havre <yorik@uncreated.net>                  *
+# *   (c) 2009, 2010 Ken Cline <cline@frii.com>                             *
+# *   (c) 2020 Eliud Cabrera Castillo <e.cabrera-castillo@tum.de>           *
+# *                                                                         *
+# *   This file is part of the FreeCAD CAx development system.              *
+# *                                                                         *
+# *   This program is free software; you can redistribute it and/or modify  *
+# *   it under the terms of the GNU Lesser General Public License (LGPL)    *
+# *   as published by the Free Software Foundation; either version 2 of     *
+# *   the License, or (at your option) any later version.                   *
+# *   for detail see the LICENCE text file.                                 *
+# *                                                                         *
+# *   FreeCAD is distributed in the hope that it will be useful,            *
+# *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+# *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+# *   GNU Library General Public License for more details.                  *
+# *                                                                         *
+# *   You should have received a copy of the GNU Library General Public     *
+# *   License along with FreeCAD; if not, write to the Free Software        *
+# *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
+# *   USA                                                                   *
+# *                                                                         *
+# ***************************************************************************
+"""Provides certain add and remove line operations of the Draft Workbench.
+
+These GuiCommands aren't really used anymore, as the same actions
+are implemented directly in the Draft_Edit command.
+"""
+## @package gui_line_add_delete
+# \ingroup DRAFT
+# \brief Provides certain add and remove line operations.
+from PySide.QtCore import QT_TRANSLATE_NOOP
+
+import FreeCADGui as Gui
+import Draft_rc
+import DraftTools
+import draftutils.utils as utils
+
+# The module is used to prevent complaints from code checkers (flake8)
+True if Draft_rc.__name__ else False
+
+
+class AddPoint(DraftTools.Modifier):
+    """GuiCommand to add a point to a line being drawn."""
+
+    def __init__(self):
+        self.running = False
+
+    def GetResources(self):
+        """Set icon, menu and tooltip."""
+        _menu = "Add point"
+        _tip = "Adds a point to an existing Wire or B-spline."
+
+        return {'Pixmap': 'Draft_AddPoint',
+                'MenuText': QT_TRANSLATE_NOOP("Draft_AddPoint", _menu),
+                'ToolTip': QT_TRANSLATE_NOOP("Draft_AddPoint", _tip)}
+
+    def IsActive(self):
+        """Return True when there is selection and the command is active."""
+        if Gui.Selection.getSelection():
+            return True
+        else:
+            return False
+
+    def Activated(self):
+        """Execute when the command is called."""
+        selection = Gui.Selection.getSelection()
+        if selection:
+            if (utils.get_type(selection[0]) in ['Wire', 'BSpline']):
+                Gui.runCommand("Draft_Edit")
+                Gui.draftToolBar.vertUi(True)
+
+
+Gui.addCommand('Draft_AddPoint', AddPoint())
+
+
+class DelPoint(DraftTools.Modifier):
+    """GuiCommand to delete a point to a line being drawn."""
+
+    def __init__(self):
+        self.running = False
+
+    def GetResources(self):
+        """Set icon, menu and tooltip."""
+        _menu = "Remove point"
+        _tip = "Removes a point from an existing Wire or B-spline."
+
+        return {'Pixmap': 'Draft_DelPoint',
+                'MenuText': QT_TRANSLATE_NOOP("Draft_DelPoint", _menu),
+                'ToolTip': QT_TRANSLATE_NOOP("Draft_DelPoint", _tip)}
+
+    def IsActive(self):
+        """Return True when there is selection and the command is active."""
+        if Gui.Selection.getSelection():
+            return True
+        else:
+            return False
+
+    def Activated(self):
+        """Execute when the command is called."""
+        selection = Gui.Selection.getSelection()
+        if selection:
+            if (utils.get_type(selection[0]) in ['Wire', 'BSpline']):
+                Gui.runCommand("Draft_Edit")
+                Gui.draftToolBar.vertUi(False)
+
+
+Gui.addCommand('Draft_DelPoint', DelPoint())