Add new preference setting to simplify colors in 2 bits for raster images

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29828 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
update log

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29829 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
sumoconvert - starting plugin development

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29831 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4