[Tagging] Synonymous values in the shop key

[Andreas Goss]

We also already have a drink: key and I wanted a food: key anyway for 
vending machines. Might also be an option.

https://wiki.openstreetmap.org/wiki/Key:drink

https://wiki.openstreetmap.org/wiki/Proposed_features/Vending-Drinks%26Food

>> A problem with "ice_cream" is there's no way to add it to a different shop.
>
>
> sells:ice_cream=industrial/artisanal/yes

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