Refactors SC.PickerPane variable names. They were pre-minified, which makes the code hard to work with.
Fixes SC.MenuPane automatic resizing to fit within the window. The positioning code used in SC.PickerPane failed to apply adjustments to the width or height of the pane, which had been calculated to fit long menus within the window. Also improves the menu positioning code to respect the value of windowPadding (previously it used hard coded secret numbers within the code).