♦︎♦︎ : Allow user to edit score field

- added NSMutableArray to track UISteppers
- modified removeScoreView to remove last added UIStepper object
- modified addScoreView to add UISteppers to stepperArray
- modified textFieldShouldReturn to check if the textField that was changed was a scoreTextField. If so, modify the appropriate stepper.value

Signed-off-by: Taylor Mott <trm36@humboldt.edu>