Function can_dig_default

plugins/dig-now.cpp:244–251

}

static bool can_dig_default(df::tiletype tt) {
    df::tiletype_shape shape = tileShape(tt);
    return shape == df::tiletype_shape::WALL ||
        shape == df::tiletype_shape::FORTIFICATION ||
        shape == df::tiletype_shape::RAMP ||
        shape == df::tiletype_shape::STAIR_UP ||
        shape == df::tiletype_shape::STAIR_UPDOWN;
}

static bool can_dig_channel(df::tiletype tt) {
    df::tiletype_shape shape = tileShape(tt);