[Tagging] Marking ticket gates

[Mateusz Konieczny]

Many places, especially metro/subway stations have automated ticked validation
system with gate/turnstile letting one through on presenting a valid ticket
(that often is also marked as used).

Some of them are turnstiles, and barrier=turnstile seems valid for them,
see https://wiki.openstreetmap.org/wiki/Tag:barrier%3Dturnstile

But some of them are not turnstiles at all - see
https://user-images.githubusercontent.com/899988/120152771-2f9b0d80-c1ee-11eb-81d2-76aa903fd6bc.png
https://user-images.githubusercontent.com/899988/120152524-dfbc4680-c1ed-11eb-8afb-83665e94607e.png

(images from https://www.engadget.com/2019-12-02-tfl-apple-pay-express-transit.html
and https://www.bbc.com/news/uk-england-london-53220111 )

How to tag them?

barrier=ticket_gate ( https://taginfo.openstreetmap.org/tags/barrier=ticket_gate )
seems a good idea to me.

Is it useful to tag turnstile in ticket validation specially?

Triggered by https://github.com/streetcomplete/StreetComplete/issues/2934
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