Add playing cards

[Enivex]

• One possibility is moving the suit symbols into this, but that would be a breaking change.
• I considered using roman numerals for the the numbering of the trump cards. However, we've just spelled out numbers elsewhere, so I did that for consistency.
• Each tarot card also has a meaning (https://en.wikipedia.org/wiki/Bourgeois_Tarot#Tarot_Nouveau) which could possibly be an alias, but I'm not sure if it's worth it.

[Enivex]

Hm, it's failing because of the text variation selector on card.joker.black.

Should I

• Remove the variation selector
• Remove the black joker for the time being
• Wait until variation selectors are supported

?

[Enivex]

Also: Is card too generic? I couldn't think of another option not involving having to use a hyphen (which we've avoided so far)

[T0mstone]

Should I

• Remove the variation selector

• Remove the black joker for the time being

• Wait until variation selectors are supported

I'd advocate for waiting on #25

[T0mstone]

Also: Is card too generic? I couldn't think of another option not involving having to use a hyphen (which we've avoided so far)

For the record, I think playingcard without any separator would be fine too.

[Enivex]

It's a bit long, but presumably anyone using this would import the submodule anyway.