pub const UI_GLYPHS: &str = "─│┌┐└┘├┤┬┴┼═║╔╗╚╝█▓▒░▀▄▌▐▶◀▲▼•·√";Expand description
The characters the font holds below the printable range, slot i holding character i: light and double box
lines, blocks and shades, arrows, markers and a tick — what a terminal UI draws with. Slots 0x20–0x7E are ASCII
and slot 0x7F holds DEL_GLYPH. A host maps a Unicode character to its slot by this table, and
scripts/dev/gen-terminal-font.py builds the font ROM by it.