Add domino tiles

[Enivex]

A submodule turned out to be super useful here, because it made it possible to have order-dependent modifiers

[T0mstone]

There's a bit of a bikeshed here about whether the plain n domino should be n.zero or n.n.

[Enivex]

There's a bit of a bikeshed here about whether the plain n domino should be n.zero or n.n.

I'm not sure I understand what you mean. Could you elaborate?

[MDLC01]

I think this is about the default variant for each domino symbol n, which I agree we may want to switch to n.n.h instead of n.zero.h

[Enivex]

I'm not well versed in dominoes, but it seems more natural to me that "five" refers to "five and nothing" instead of "five and five". The current order is also convenient because it's sorted.

[Enivex]

Did you mean something like this then?

five
    .five.h 🁙
    .five.v 🂋
    .zero.h 🁔
    .zero.v 🂆
    .one.h 🁕
    .one.v 🂇
    .two.h 🁖
    .two.v 🂈
    .three.h 🁗
    .three.v 🂉
    .four.h 🁘
    .four.v 🂊
    .six.h 🁚
    .six.v 🂌

I'm not a fan, but I guess I'll defer to someone who actually knows anything about dominoes.

My understanding is that a domino with two fives on it would be referred to as a "double"

(There's also the question of whether the exact fallback is even important.)