Draw the custom glyph tritmap for overline (‾)
Draw the custom glyph tritmap for overline (‾)

This is the only glyph not in the CP437 font already, but it is
important for ternary overlines to complement underlines..

thirdcoder/trit-text,thirdcoder/trit-text,thirdcoder/trit-text,thirdcoder/trit-text