* lisp/play/gomoku.el: Don't use intangible property. Use lexical-binding.
(gomoku--last-pos): New var. (gomoku--intangible-chars): New const. (gomoku--intangible): New function. (gomoku-mode): Use it. Derive from special-mode. (gomoku-move-up): Adjust line count. (gomoku-click, gomoku-point-y, gomoku-point-square, gomoku-goto-xy) (gomoku-plot-square, gomoku-init-display, gomoku-cross-qtuple): Simplify accordingly.
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