Replace movement variables with an alist and accessor
* lisp/play/dunnet.el (north, south, east, west, northeast, southeast): (northwest, southwest, up, down, in, out): Remove. (dun-movement-alist): New constant. (dun-movement): New function. (dun-n, dun-s, dun-e, dun-w, dun-ne, dun-se, dun-nw, dun-sw, dun-up): (dun-down, dun-in, dun-out): Use a symbol for indicating movement. (dun-move, dun-special-move): Translate movement symbol to an enumeration.
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