Bulk card deactivation

[DheGit]

It's tiring to go through each and every name, roll number in an excel sheet just to go to the Mess-I dashboard and deactivate the cards, one-by-one.

Introduce a bulk deactivation functionality, with a well-placed button on the Student's List page.
On trigger, this should popup a dialog box, which accepts a CSV file, which is processed by the frontend and as the last step, a request to the backend is made.

Backend performs the update (this logic is not in scope of the frontend) in the database as a response to the request.