parse string as char

[FG via Digitalmars-d-learn]

Of course consuming it dchar by dchar also works:

     string s = `\tabŁŃ\r\nx`;
     assert(parseDchar(s) == '\t');
     assert(parseDchar(s) == 'a');
     assert(parseDchar(s) == 'b');
     assert(parseDchar(s) == 'Ł');
     assert(parseDchar(s) == 'Ń');
     assert(parseDchar(s) == '\r');
     assert(parseDchar(s) == '\n');
     assert(parseDchar(s) == 'x');
     assert(s.empty);