added script for player skill level grepping. changed gen_worldmap to use the gridmap and plt files.
changed directory detection in gen_worldmap a bit
changed worldmap a bit (removing landbridges). and removed mountain3 from it and from gen_worldmap and from palette.
some fixes on the worldmap and gen_worldmap
added some convenience functionality to gen_worldmap. see 'gen_worldmap -h'
added palette generation by script call 'gen_worldmap palette' to generate a palette.
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