[REQUEST] Legacy Computing graphs

[gaussandhisgun]

Is your feature request related to a problem? Please describe.
Unicode has this cool character block called Symbols For Legacy Computing. https://en.wikipedia.org/wiki/Symbols_for_Legacy_Computing Its not implemented everywhere, obviously, but neither are braille fonts, and tbh this could be a cool way to display graphs, with all the diagonal lines and whatnot. Assuming a supported terminal of course.

Describe the solution you'd like
Adding a 4th option to "Graph Font" called "Legacy Computing" which uses the aforementioned code block to make cool graphs - either by using the grid part of the block as a 3x2-per-character display, similar to how Braille is operated right now, or with some fancy math to draw the graph with the diagonal lines that go after it. Maybe both, toggleable in the same Graph Font menu!

Describe alternatives you've considered

Additional context
Here's a mockup.

----- BRAILLE -----
                          
⢀       ⡀          ⢰⢰     
⢸⢀    ⢀⢠⣷⡀⡄⢀⡀⡆     ⢸⣾⣀⣀  ⢀
⢀⣿⣾⣶⣶⣿⣤⣾⣿⣿⣿⣿⣾⣿⣿⣷⣾⣶⣷⣴⣿⣿⣿⣿⣶⣷⣿
⠈⣿⢿⠿⠿⣿⠛⢿⣿⣿⣿⣿⢿⣿⣿⡿⢿⠿⡿⠻⣿⣿⣿⣿⠿⡿⣿
⢸⠈    ⠈⠘⡿⠁⠃⠈⠁⠇     ⢸⢿⠉⠉  ⠈
⠈       ⠁          ⠸⠸     
                      

     ----- GRID -----
     
                          
🬞       🬏          🬦🬦     
▐🬞    🬞🬦🬺🬏🬓🬞🬏🬓     ▐🬻🬭🬭  🬞
🬞█🬻🬹🬹█🬹🬻████🬻██🬺🬻🬹🬺🬹████🬹🬺█
🬁█🬬🬎🬎█🬎🬬████🬬██🬝🬬🬎🬝🬎████🬎🬝█
▐🬁    🬁🬉🬝🬀🬄🬁🬀🬄     ▐🬬🬂🬂  🬁
🬁       🬀          🬉🬉     

… and how it looks in a real terminal:

(Blackbox, Terminus 12)

[akamayu-ouo]

I think the 3x2 grid characters can be integrated in the current "block" mode, which uses 2x2 grid characters, to increase the representable height levels from three ▄█ (0, 1/2, 1) to five 🬭▄🬹█ (0, 1/3, 1/2, 2/3, 1). If this is desirable, I can work on this issue.