The "worldmap.labels" map is keyed by namedarea.id (corresponding to map.area), while the "mapLocations" map is keyed by map.id. This causes worldmap labels to be marked for removal when there's a namedarea.id that does not match any map.id, which happens to be true for all namedareas except crossglen and crossroads.
This logic is unnecessary anyway, because WorldMapView.pushToModel is only invoked by WorldmapSegment.pushToModel, which only triggers when maps are added or moved, but not deleted. Deletions are instead handled by WorldmapSegment.elementChanged. As such, it should never be the case that a label is removable in a pushToModel call.
handle adding spritesheets. Fixed colorfilters not showing on the
worldmap and replacements simulator. Added "display type" (a.k.a rarity)
item field in the Items comparator.
Added support for the new "colorfilter" map property. Due to Java2D
having no correct color filter support, only the "blackXX" values can be
previwed. "bw" and "invert" cannot, the performance cost was simply way
too high.
