Interactively give STROKE the global binding as COMMAND.
Operated just like `global-set-key', except for strokes.
COMMAND is a symbol naming an interactively-callable function. STROKE
is a list of sampled positions on the stroke grid as described in the
documentation for the `strokes-define-stroke' function.
See also `strokes-global-set-stroke-string'.
(fn STROKE COMMAND)