Migrated StoryboatdTable_LocalAuthentication to unified api

Changed PopViewControllerAnimated to PopViewController
Migrated StoryboardTable to unified api

Changed PopViewControllerAnimated to PopViewController
Migrated StoreKit/ProductView to unified api

Changed DismissModalViewControllerAnimated to DismissModalViewController
Migrated StoreKit/NonConsumables to unified api
Migrated StoreKit/HostednonConsumables to unified api
Migrated StoreKit/Consumables to unified api

Some int/nint switching and casting
Migrated Stars to unified api

Had to cast a Math.Abs to float, as an nfloat was used as the parameter
for Math.Abs and it used the double overload of Math.Abs instead of the
float overload
Migrated SpriteTour to unified api

Changed the return type of a method from PointF to CGPoint (the actual
object being returned in the method code changed automatically though),
and some float/nfloat casting
Migrated SpriteKitPhysicsCollection to unified api

Some float/nfloat casting, and removed a reference to the obj-c Release
method.
Migrated SpriteKit to unified api