Fixes CRASH when adding a CKFormBindedCollectionSection with existing content in the collection into a form table view controller.
ViewController+Style : Priority for view controller style lookup is its own style manager scope then we look in its view controller hierarchy.
CKStyleView : Extends the separatorInsets to UIEdgeInsets instead of CGFloat so that we can choose the insets on left and right as well as the capacity of insetting the separator top and bottom.