#22 Created two functions to return the solution steps and the number of solution steps for a given sentence number
#22 Created currentStep variable to keep track of active step for solutions
#22 Created checkSolutionForSubject function that locks user out of selecting any object but the correct one for group step types. If it’s correct, it increments the current step.
Created function to convert ActionStep to PossibleInteraction and modified performSetupForActivity to use this function.