added right- and left-hand traffic database
(new mapcss pseudo-class-condition :righthandtraffic)
Data file (data/left-right-hand-traffic.osm) license: CC0.
Loosely based on boundary lines data from naturalearthdata.com.
Traffic law info from wikipedia.
Boundaries generalized, especially in areas where there seem to be no roads.
Should be mostly correct, but some remote islands and atolls may be assigned wrongly.
Alway check before you start driving. :)
Added fast lookup index similar to QuadBuckets.