remove wire_fence and wood_fence presets

[richlv]

#6220 added wire_fence and wood_fence.
these are considered to be very bad choices by some, as they endlessly proliferate keys/tags.

a much better approach would be barrier=fence coupled with fence=wood, fence=wire etc

otherwise there is no limit to what could be stuffed in the barrier tag - barrier=wood_fence_with_3_cm_openings...

this makes renderer and other software authors' life much harder, as they can't know in general that barrier=fence is a fence - they have to consider about gazillion of other possibilities

[simon04]

Before changing the preset, we should take into consideration the actual number of tag usages:

• ​http://taginfo.openstreetmap.org/keys/barrier#values (search for fence; 12k for (wire|wood)_fence)
• ​http://taginfo.openstreetmap.org/keys/fence_type#values (2k in total)
• ​http://taginfo.openstreetmap.org/keys/fence%3Atype#values (334)

Probably we should discuss how to deal with deprecated but common tags in general.

[richlv]

i'd guess those existing values come from previous presets ;)

general handling principles would be great, but might be better solved in a separate ticket

[simon04]

In [4443/josm]:

fix #6803 - remove wire_fence and wood_fence presets

[simon04]

Replying to simon04:

Probably we should discuss how to deal with deprecated but common tags in general.

A validation test for deprecated tags was added in r4442.