Set the starting value when cycling through values

[taeh98]

At the moment, when the user first presses the button to increment a spinner, it starts incrementing from the min value in the defined steps. Please could you add a prop that defines this initial value before incrementing or decrementing? For example, if the value of the spinner is initially undefined and the user taps the increment or decrement button, the value of the spinner will then change to the value of this prop instead of the min value (as is currently the case). The user can then tap or hold the buttons more to continue changing the value of the spinner.