New live version with the following enhancements:

* Internal restructuring around new monad typeclass and two new monads.
* New executable for weekly cronjob to reset time wasted and deduct
  points for the classes that wasted the most time.
* Some new hotkey bindings.
* The `Custom' button on the activity count-down clock now validates
  input to avoid the clock become the startling `NaN:NaN:NaN'.
* Scores table colouring improved: whole columns now coloured, not just
  the first row.
* New sound effect.
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