Openstreetmap-carto: add line rendering for benches

[HolgerJeromin]

As reported in #1824

Some benches are tagged as lines
http://www.openstreetmap.org/way/313487068
http://www.openstreetmap.org/way/79639567
http://www.openstreetmap.org/way/79639568

[pnorman]

I can't think of any way to render them except for sticking the bench symbol somewhere on the linestring.

Surprisingly, there are about 3k benches mapped as lines.

[HolgerJeromin]

you are right, this is a problem. But i think the symbol in the middle is a good enough solution.

[jojo4u]

Tagging as way is allowed in wiki since 2011 and makes sense for long ones. Symbol in middle sounds reasonable.

http://wiki.openstreetmap.org/w/index.php?title=Tag:amenity%3Dbench&oldid=705902

[NonnEmilia]

Now the benches mapped as line are 7k (according to taginfo).

[Tomasz-W]

I would like to see some examples of bench ways rendered as brown lines. What do you think?

[kocio-pl]

That would probably look like tracks, isn't it?

[pnorman]

I don't see how it would be obvious to someone that a brown line means a bench line, particular given the confusion with existing brown lines.

[Tomasz-W]

@kocio-pl Please close this ticket as a duplicate of https://github.com/gravitystorm/openstreetmap-carto/issues/2711 meta ticket. Move further discussion there.