- the application now uses only the default values from the app.options dict, the app.defaults dict holds the definitive default values

- fixed some outstanding issues from the PyQt6 port
- PEP8 fixes
- minor fixes
- updated the saving of Preferences to update the self.options too: the `Apply` action will update the self.options but the `Save` action will save the updated preferences to the file on disk

appPlugins/ToolPcbWizard.py

@@ -331,7 +331,7 @@ class PcbWizard(AppTool):
             self.process_finished = True
 
         # Register recent file
-        self.app.defaults["global_last_folder"] = os.path.split(str(filename))[0]
+        self.app.options["global_last_folder"] = os.path.split(str(filename))[0]
 
     def on_import_excellon(self, signal=None, excellon_fileobj=None):
         self.app.log.debug("import_2files_excellon()")