Media: Reverse, Fast Forward to End, Fast Reverse to Start
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## Icon Request

Naming can be discussed, but in some applications one would like the fast forward/rewind buttons ending with a bar. Similarly, a "reverse" button, i.e., a mirrored play button is useful. There are suitable Unicode code points for all of them:
https://www.compart.com/en/unicode/U+23ED
https://www.compart.com/en/unicode/U+23EE
https://www.compart.com/en/unicode/U+23F4

Maybe one should also add mini versions, although for my use, the standard sizes are enough.

* Icon name: reverse, rewind-to-start, forward-to-end? 
* Tags of this icon: Media
* Use case: Going to start or end, playing backwards
* Screenshots of similar icons: ⏴⏭⏮

Since these should be quite simple to obtain from the existing ones, I can provide a PR (for the icons, not sure how to build the font) if you think that they are worthwhile to add.
