Add support for loyalty cards

[jackdur]

Is your feature request related to a problem? Please describe.
Now I use Catima and KeePassDX at the same time and it's annoying because I have to juggle with two vaults/databases. The common thing between both of these is that them are about secrets/tokens and only the presentation differs. Passwords is just secrets that are used as such, TOTP seeds are secrets that is used through a generator and loyalty cards are secrets that is used in the form of a QR code or barcode. Just simple string name-value pairs.

Describe the solution you'd like
Default form for loyalty card and QR and Code 128 barcode generator.