Migrated SoZoomy to unified API

- Cast double to float
- Cast nfloat to float
- Changed AVCaptureFocusMode.ModeAutoFocus to .AutoFocus
- Removed .ToString from AVLAyerVideoGravity.RespectAspectFill when
setting it as value fo AVCaptureVideoPreviewLayer.VideoGravity
- Removed MonoTouch namespace from full type name