Multi wallet support

[MartinSchmidt]

Add functionality to enable users to have multiple wallets.

[MartinSchmidt]

@Mike4Elia I think we need to have some more talk about what specific functionality you need with multi-wallet, I have already begone implementing some of it in a Draft PR but it opens a host of new questions.

I would actually like if you would be able to write a use-case of two describing what type of user, and the specific usecase for them, both to document why we are doing it, but also better understand it.