Mathdoku & Killer Sudoku

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***** v 4.00 MAJOR RELEASE ******

- best Sudoku variant is even better now, Mathdoku Extended evolved
- play Killer Sudoku on the same platform
- DigitCalc completely integrated
- lazy mode option in settings to automate trivial solutions
- sum numbers in cages to help in Killer Sudoku solving
- long press back button to set checkpoint and rewind to it
- long press on 2 or 3 maybes to remove trivial maybes in other cells

- v 4.02 small bug-fix