New functions for picker wheels

Added a function to scroll picker wheels scrollToValue()
- Better implementation than UIAPickerWheel.selectValue(x)
- Works also for texts
- Poorly works not for UIDatePickers -> because .values() which get all values of wheel does not work :(
   (I think this is a bug in UIAutomation!)

Added a function realValue() to get "real" values of picker wheels
- Wheels filled with values return for .value()  "17. 128 of 267" ?? don't know why -> for comparisons this is unuseful!!
- If you want to check a value of a wheel this function is very helpful