Allow selective disclosure when answering a presentation request

[etschelp]

Indy:

Currently all attributes are always revealed when answering a presentation request. This could stay as the default option, but it makes sense to have the option (per attribute, or attribute group, depending on the request) not to reveal information, this could be as simple as a checkbox.

Dif:

Same as above but on top we need the option to switch between Ed25519S and bbs+ when issuing credentials and sending the presentation request. Also the dif request needs a different format and the limit disclosure flag in this case.