[Tagging] Rendering for shop=boutique/fashion on default style

[Daniel Koć]

I was about to add new icon for shop=boutique and shop=fashion on our 
default style, but after short discussion it seems we need some 
clarification of these schemes definition:

https://github.com/gravitystorm/openstreetmap-carto/issues/1706

The only sure thing is shop=clothes, both boutique and fashion are not 
clearly defined and have "de facto" status. What should we do with them? 
Is there a way to clearly define such shops and - if yes - what tagging 
scheme should be used and which one should be deprecated? Should they 
have their own tag at all or just additional tag for shop=clothes?

-- 
"The train is always on time / The trick is to be ready to put your bags 
down" [A. Cohen]