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/ViewProviderGeometryObject.pyi

@@ -0,0 +1,21 @@
+from Base.Metadata import no_args
+from ViewProviderDocumentObject import ViewProviderDocumentObject
+
+
+class ViewProviderGeometryObject(ViewProviderDocumentObject):
+    """
+    This is the ViewProvider geometry class
+
+    Author: Werner Mayer (wmayer@users.sourceforge.net)
+    Licence: LGPL
+    """
+
+    @staticmethod
+    @no_args
+    def getUserDefinedMaterial() -> object:
+        """
+        getUserDefinedMaterial() -> object
+
+        Get a material object with the user-defined colors.
+        """
+        ...