[Tagging] Deprecate amenity=youth_centre in favour of sub-tag community_centre=* or community_centre:for=*

[Tom Pfeifer]

To prevent tag fragmentation, I think that amenity=youth_centre
should be deprecated, and tagged

    amenity=community_centre
    community_centre=youth[_centre]

amenity=community_centre is used 29307 times, and rendered with icon
and name on the general map.

The wiki definition of community_centre includes youth centres, among
other locations targeted at specific age groups. Thus it makes sense
to specify them with a sub-tag.

amenity=youth_centre is only listed as a "tag being used" in the wiki,
and used 759 times. An overpass query shows that these uses focus
mainly on Germany and England (UK).

Sub-tagging with community_centre=* was already proposed on the talk
page in 2010, though the key is only used 71 times so far, for describing
the target groups, such as =children or =elder

An alternative would be to reserve the community_centre=* for the type
of the facility (e.g. =meeting_room, assembly_hall), and follow the scheme
introduced in social_facility:for=*, that means defining community_centre:for=*,
with mostly the same values. The social_facility:for scheme is well supported
with 8534 uses. Example:

   amenity=community_centre
   community_centre:for=juvenile


tom