Function fl::smush::uni_smush

pub fn uni_smush(c1: u8, c2: u8, hard_blank: u8) -> u8

Universal smushing simply overrides the sub-character from the earlier FIGcharacter with the sub-character from the later FIGcharacter. This produces an "overlapping" effect with some FIGfonts, wherin the latter FIGcharacter may appear to be "in front".