TODO:
- update world file when chat commands are used
- update inventories when items are replaced:
	- creative
	- storage (chests, etc.)
- add LBM when removing an item if it is a node
- add "radius" option for pencil or "xlen", "ylen", & "zlen" options
- add "xrotate" & "zrorate" modes for pencil
- don't require "server" priv for "find_unknown_nodes" & "find_neaby_nodes" commands
- add chat command to find nodes with specified attributes
- may be better to update player inventories on login than add aliases for items
- use aliases for unknown nodes instead of LBM
- only use LBM when a node to replace is still registered