[Tagging] Mapping of kids areas

[Andreas Goss]

> I don't see a need for a new key here.
> The properties can be easily modelled with sub-tagging of playground:
>
> leisure=playground
> playground:supervised=yes/no
> playground:outdoor=yes/no
> playground:indoor=yes/no

I agree in general, but the main issue with tagging like this is that I 
bet most data consumers will just look for leisure=playground and that's 
it.
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