Commands
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/map_wait [wait] - set wait between tile renders (ms)
/map_stat - query number of tiles in render queue
/map_regen - regenerate entire map (currently buggy)
/map_debug - send map debugging messages
/map_nodebug - disable map debugging messages
/map_regenzoom - regenerates zoom-out tiles

/addsign [name] - adds a named sign to the map
/removesign [name] - removes a named sign to the map
/listsigns - list all named signs
/tpsign [name] - teleport to a named sign

server.properties
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map-colorsetpath - point to colors.txt
map-tilepath - point to web/tiles folder
map-signspath - point to signs.txt file (do not need to create the file, one will be created when you create a sign)
map-serverport - the port the web server runs on (default is 8123)
map-showmarkers - a list of which markers to show on the map, comma separated if multiple (spawn, homes, warps, signs, players, all, none)
map-generateportraits - whether player-portraits are generated by the server (0, 1, default: 0)