for class diagrams

Modify the SRC_FILE and DEST_FILE and DEST_XML_FILE in the .py file and run the .py file in the terminal; It's watching for the SRC_FILE changes to update the DEST_FILE accordingly. the classdiagram.drawio and classes.ts are the examples.

Required modifications

• add a "class" at the beginning of classes names
• add dtype at the beginning of the custom type indicators