Provide an ASCII and an unicode preview #114
Description
Provide an option to switch between an ASCII and an unicode preview.
Some monospaced fonts don't support the used unicode characters. This leads to correct-characters beeing misaligned.
With pure ASCII this does not happen. The downside it doesn't look that pretty and multiple characters are needed to represent an unicode character
the option can be 'asci and 'unicode. nil is considered an invalid value and will default to 'asci.