UnNetHack 5: add missing fern tiles
unchozo32b: add new tiles for several UnNetHack monsters

arctic fern spore
arctic fern sprout
arctic fern
blazing fern spore
blazing fern sprout
blazing fern
dark Angel
dungeon fern spore
dungeon fern sprout
dungeon fern
fern spore
striped shirt
swamp fern spore
swamp fern sprout
swamp fern