Fix issues:

+ improve formatting
+ remove superfluous semicolons
+ comment unused parameters
+ rename Initialisation to Initialization
+ rename Deinitialisation to Finalization
+ remove spaces

src/App/Extension.cpp

@@ -186,4 +186,4 @@ EXTENSION_PROPERTY_SOURCE_TEMPLATE(App::ExtensionPython, App::ExtensionPython::I
 
 // explicit template instantiation
 template class AppExport ExtensionPythonT<Extension>;
-}
+}