Sound effects and colourblind update
Sound effects and colourblind update

Sound effects are now played when you get an answer right or wrong.
Added a global parameter, $colourblind, which when set to True, causes
the program to use a blue checkmark and blue text for correct mini test
answers (instead of green).

jwcarr/flatlanders,jwcarr/flatlanders,jwcarr/flatlanders,jwcarr/flatlanders