Function encode_nrbt 

pub fn encode_nrbt(b: u8) -> char

Translate a u8 to binary representation using the nrbt encoding

nrbt: most significant nibble right, most significant bit top

Left	Right
8	128
4	64
2	32
1	16

use bbd_lib::*;

assert_eq!(
    (0..=255).map(|x| encode_nrbt(x)).collect::<String>(),
    "\
        ⠀⡀⠄⡄⠂⡂⠆⡆⠁⡁⠅⡅⠃⡃⠇⡇⢀⣀⢄⣄⢂⣂⢆⣆⢁⣁⢅⣅⢃⣃⢇⣇⠠⡠⠤⡤⠢⡢⠦⡦⠡⡡⠥⡥⠣⡣⠧⡧⢠⣠⢤⣤⢢⣢⢦⣦⢡⣡⢥⣥⢣⣣⢧⣧\
        ⠐⡐⠔⡔⠒⡒⠖⡖⠑⡑⠕⡕⠓⡓⠗⡗⢐⣐⢔⣔⢒⣒⢖⣖⢑⣑⢕⣕⢓⣓⢗⣗⠰⡰⠴⡴⠲⡲⠶⡶⠱⡱⠵⡵⠳⡳⠷⡷⢰⣰⢴⣴⢲⣲⢶⣶⢱⣱⢵⣵⢳⣳⢷⣷\
        ⠈⡈⠌⡌⠊⡊⠎⡎⠉⡉⠍⡍⠋⡋⠏⡏⢈⣈⢌⣌⢊⣊⢎⣎⢉⣉⢍⣍⢋⣋⢏⣏⠨⡨⠬⡬⠪⡪⠮⡮⠩⡩⠭⡭⠫⡫⠯⡯⢨⣨⢬⣬⢪⣪⢮⣮⢩⣩⢭⣭⢫⣫⢯⣯\
        ⠘⡘⠜⡜⠚⡚⠞⡞⠙⡙⠝⡝⠛⡛⠟⡟⢘⣘⢜⣜⢚⣚⢞⣞⢙⣙⢝⣝⢛⣛⢟⣟⠸⡸⠼⡼⠺⡺⠾⡾⠹⡹⠽⡽⠻⡻⠿⡿⢸⣸⢼⣼⢺⣺⢾⣾⢹⣹⢽⣽⢻⣻⢿⣿\
    ",
);