Option to show both archived and active cards

[dadosch]

Is your feature request related to a problem? Please describe.
A option which shows both, active and archived, cards would be good because it gives an overview what you have already achieved and what still needs to be done

Describe the solution you'd like
archived cards could be shown greyed out, the others normal.

Currently, you can switch only between archived or active cards, there is no possibility to show both

[juliusknorr]

I added this as an addition to #414