[Tagging] Regional stylesheets for osm-carto (Was: rendering of local power lines)

[Michał Brzozowski]

Consider that every major map provider does this (Japanese train
lines, and sometimes icons like that stylized katakana "te" for post
offices). Also highway shields. Although OSM-carto is not supposed to
be consumed by end-users, it often is; moreover it could be serve as
an example on how to implement that (in order to encourage other OSM
rendering style authors to do so).

Michał