/* Return yx_uint16 coordinate one step from coordinate yx in direction "dir"
* (east: 'E', west: 'W', north: 'N', south: 'S').
*
/* Return yx_uint16 coordinate one step from coordinate yx in direction "dir"
* (east: 'E', west: 'W', north: 'N', south: 'S').
*