added (currently unchecked) global rendermode option support

overviewer.py

@@ -97,6 +97,7 @@ def main():
     parser.add_option("--forcerender", dest="forcerender", help="Force re-rendering the entire map (or the given regionlist). Useful for re-rendering without deleting the entire map with --delete.", action="store_true")
     parser.add_option("--rendermodes", dest="rendermode", help="Specifies the render types, separated by commas. Use --list-rendermodes to list them all.", type="choice", choices=avail_rendermodes, required=True, default=avail_rendermodes[0], listify=True)
     parser.add_option("--list-rendermodes", dest="list_rendermodes", action="store_true", help="List available render modes and exit.", commandLineOnly=True)
+    parser.add_option("--rendermode-options", dest="rendermode_options", default={}, configFileOnly=True)
     parser.add_option("--imgformat", dest="imgformat", help="The image output format to use. Currently supported: png(default), jpg.", configFileOnly=True )
     parser.add_option("--imgquality", dest="imgquality", default=95, help="Specify the quality of image output when using imgformat=\"jpg\".", type="int", configFileOnly=True)
     parser.add_option("--bg_color", dest="bg_color", help="Configures the background color for the GoogleMap output.  Specify in #RRGGBB format", configFileOnly=True, type="string", default="#1A1A1A")
@@ -217,7 +218,7 @@ def main():
 
     logging.info("Welcome to Minecraft Overviewer!")
     logging.debug("Current log level: {0}".format(logging.getLogger().level))
-   
+       
     useBiomeData = os.path.exists(os.path.join(worlddir, 'biomes'))
     if not useBiomeData:
         logging.info("Notice: Not using biome data for tinting")