FeathersControl: better support for scaleX and scaleY
ScrollText: padding property tweak (closes #572)
PickerList, Item Renderers: better handling of String values in data providers. uses 'as String' if string and '.toString()' if anything else (closes #578)
MetalWorksMobileTheme: scroll bars skinned in initializers instead of in factory
MinimalMobileTheme: default layout for toolbar scroll container is skipped if layout isn't null
AeonDesktopTheme: modernized some practices