Notifications administrators settings

When allocating a staff member as client's manager, they receive notifications for everything to do with the clients they manage (accounts, bookkeeping, payroll, companies house changes, etc.). As a lot of staff members work on different aspects of the client's file, and to manage the number of notifications they receive, it would be useful when setting up or maintaining a BM user, to be able to select which notifications users need to receive. This should help with managing the information overload users can sometimes get with notifications.