[predefined-counter-styles] Clock face emoji counter style

Crissov has just created a new issue for 
https://github.com/w3c/predefined-counter-styles:

== Clock face emoji counter style ==
At U+1F550…B, there are twelve emoji characters showing the face of an
 analog clock, i.e. the full hours. That could be used as a cyclic 
custom counter in one of two ways:

- `clock-face` 1…12: 🕐🕑🕒🕓🕔🕕🕖🕗🕘🕙🕚🕛
- `clock-face` 0…11: 🕛🕐🕑🕒🕓🕔🕕🕖🕗🕘🕙🕚

Half-hours, but not quarter-hours or other parts, are also available 
at the succeeding twelve code positions U+1F55C…67, but I’m not 
convinced they’d be useful in a counter style:

- 🕜🕝🕞🕟🕠🕡🕢🕣🕤🕥🕦🕧

See https://github.com/w3c/predefined-counter-styles/issues/9
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