Add deprecation notices to SWIG API

pcbnew/python/swig/pcbnew.i

@@ -30,6 +30,16 @@
 
 %module pcbnew
 
+%pythoncode
+{
+import warnings
+warnings.filterwarnings("default", category=DeprecationWarning, module=__name__)
+warnings.warn("The SWIG-based Python interface to the PCB editor is deprecated and will be removed "
+              "in a future version of KiCad.  Please plan to move to the new IPC API and/or make "
+              "use of the kicad-cli tool for your KiCad automation needs.",
+               category=DeprecationWarning)
+}
+
 %feature("autodoc", "1");
 #ifdef ENABLE_DOCSTRINGS_FROM_DOXYGEN
 %include "docstrings.i"

scripting/kicad_pyshell/__init__.py

@@ -79,6 +79,12 @@ class KiCadPyShell(KiCadEditorNotebookFrame):
         """
         self.notebook = KiCadEditorNotebook(parent=self.parent)
         intro = 'Py %s' % version.VERSION
+
+        intro += """\n\nDeprecation Notice:\n
+This SWIG-based Python interface to the PCB editor is deprecated and will be removed 
+in a future version of KiCad.  Please plan to move to the new IPC API and/or make 
+use of the kicad-cli tool for your KiCad automation needs.\n\n"""
+
         import types
         import builtins
         module = types.ModuleType('__main__')