Ability to change bank account details in user profile

One-sentence description

A field in a users profile to change the bank account details

Motivation

Currently this can only be done by an admin. It would be nice if people could do it themselves as well.

Desired functionality

Less paper work when people want to reimburse costs, as a consequence of Conscribo sync (and it could also be some preparation to the wallet system but it has a practical use now as well).

Suggested implementation

In the public profile, a field 'IBAN', 'BIC' and 'ACCOUNT HOLDER' that people can edit. For IBAN I guess there are libraries to validate IBANs, for BIC maybe there is as well or you could make dict with common BICs.

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