speed up reset

This brings its pitch down a little, so it isn't quite as annoying.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
use absolute clock_nanosleep()

This should give a more periodic behavior. It's not real noticeable
right now, though.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
add mario song

Not finished, but it's a start for providing scores.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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