Function getMeshPoint

Marlin/src/lcd/extui/ui_api.cpp:875–875

      bed_mesh_t& getMeshArray() { return bedlevel.z_values; }
      float getMeshPoint(const xy_uint8_t &pos) { return bedlevel.z_values[pos.x][pos.y]; }
      void setMeshPoint(const xy_uint8_t &pos, const_float_t zoff) {
        if (WITHIN(pos.x, 0, (GRID_MAX_POINTS_X) - 1) && WITHIN(pos.y, 0, (GRID_MAX_POINTS_Y) - 1)) {
          bedlevel.z_values[pos.x][pos.y] = zoff;