Modification for custom apps edit-interface regarding MIS-GAPP


**Functionalities implemented:**

1) **Patch added for updating attribute_type_set and relation_type_set fields for MIS-GAPP GSystemTypes**

- Files modified:

  1) create_schema
     - Patch added.
     - Logs implemented.
   
2) **Intermediate Changes reverted that has been done for MIS-GAPP's edit-interface**

- Files modified/deleted:

  1) templates/ndf/custom_app_create_edit.html (Deleted)
  2) templates/ndf/custom_template_for_app.html
  3) urls/__init__.py
  4) views/custom_app_view.py

3) **Git changes: Code added to skip "schema_files" directory**

- Files modified:

  1) .gitignore
  
4) **Top bar animation modified for time being.**

- Files modified:

  1) static/ndf/js/app.js