Gui: Convert XML bindings to Python API bindings model.

This converts the existing XML binding files to the new Python bindings
generator model.

src/Gui/PythonWorkbench.pyi

@@ -0,0 +1,142 @@
+from Base.Metadata import export
+from Workbench import Workbench
+from warnings import deprecated
+
+
+@export(
+    Twin="PythonBaseWorkbench",
+    TwinPointer="PythonBaseWorkbench",
+    Include="Gui/Workbench.h",
+)
+class PythonWorkbench(Workbench):
+    """
+    This is the class for Python workbenches
+
+    Author: Werner Mayer (wmayer@users.sourceforge.net)
+    Licence: LGPL
+    """
+
+    def appendMenu(self) -> None:
+        """
+        Append a new menu
+        """
+        ...
+
+    def removeMenu(self) -> None:
+        """
+        Remove a menu
+        """
+        ...
+
+    def appendContextMenu(self) -> None:
+        """
+        Append a new context menu item
+        """
+        ...
+
+    def removeContextMenu(self) -> None:
+        """
+        Remove a context menu item
+        """
+        ...
+
+    def appendToolbar(self) -> None:
+        """
+        Append a new toolbar
+        """
+        ...
+
+    def removeToolbar(self) -> None:
+        """
+        Remove a toolbar
+        """
+        ...
+
+    def appendCommandbar(self) -> None:
+        """
+        Append a new command bar
+        """
+        ...
+
+    def removeCommandbar(self) -> None:
+        """
+        Remove a command bar
+        """
+        ...
+
+    @deprecated
+    def AppendMenu(self) -> None:
+        """
+        deprecated -- use appendMenu
+        """
+        ...
+
+    @deprecated
+    def RemoveMenu(self) -> None:
+        """
+        deprecated -- use removeMenu
+        """
+        ...
+
+    @deprecated
+    def ListMenus(self) -> None:
+        """
+        deprecated -- use listMenus
+        """
+        ...
+
+    @deprecated
+    def AppendContextMenu(self) -> None:
+        """
+        deprecated -- use appendContextMenu
+        """
+        ...
+
+    @deprecated
+    def RemoveContextMenu(self) -> None:
+        """
+        deprecated -- use removeContextMenu
+        """
+        ...
+
+    @deprecated
+    def AppendToolbar(self) -> None:
+        """
+        deprecated -- use appendToolbar
+        """
+        ...
+
+    @deprecated
+    def RemoveToolbar(self) -> None:
+        """
+        deprecated -- use removeToolbar
+        """
+        ...
+
+    @deprecated
+    def ListToolbars(self) -> None:
+        """
+        deprecated -- use listToolbars
+        """
+        ...
+
+    @deprecated
+    def AppendCommandbar(self) -> None:
+        """
+        deprecated -- use appendCommandBar
+        """
+        ...
+
+    @deprecated
+    def RemoveCommandbar(self) -> None:
+        """
+        deprecated -- use removeCommandBar
+        """
+        ...
+
+    @deprecated
+    def ListCommandbars(self) -> None:
+        """
+        deprecated -- use listCommandBars
+        """
+        ...