Show full line with escape sequences

Escape sequences are weird, because they specify numbers that "look
like" bytes but they actually seem to care about the character values.
E.g. not byte 30 but character '3' and character '0'.  Odd.

zig/sdl/hello_sdl.zig

                var part = parts.next();
                while (part != null and part.?.len != repl_size) : (part = parts.next()) {
                    if (part.?.len > 0) {
                        std.debug.print("escape char: {d} {s}\n", .{ part.?[0], part.?[1..] });
                        std.debug.print("escape char: {d} {s}\n", .{ part.?[0], part.?[0..] });
                    }
                }