checkForNextDifficulty

difficulty ramping implemented for Exercise 1a and 1b
1b changeParameters switch

1b changeParameters now does 1-2 octaves of keyboard based on
difficulty for trebleStaff and bassStaff
AND
2-4 octaves based on difficulty for BOTH starves

:D
1b - "Find any X on the keyboard"

-piano.higlightRealID()
-implemented taskType