Constant GRID_BLANK

pub const GRID_BLANK: Grid;

A (mostly) blank Grid - (1, 1) is walkable

use core_pb::grid::standard_grid::GRID_BLANK;
use core_pb::grid::Grid;
use core_pb::grid::computed_grid::ComputedGrid;

let grid: Grid = GRID_BLANK;
let computed_grid: ComputedGrid = grid.try_into().unwrap();