OrientationManager

To force only one controller to be at landscape orientation.

Add OrientationManager to project:

```swift
class OrientationManager {

    static let shared = OrientationManager()

    /// you can set any orientation to lock
    var orientationLock = UIInterfaceOrientationMask.portrait

    /// lock orientation and force to rotate device
    func lock(for orientation: UIInterfaceOrientationMask, rotateTo rotateOrientation: UIInterfaceOrientation) {
        orientationLock = orientation
        UIDevice.current.setValue(rotateOrientation.rawValue, forKey: "orientation")
    }
}
```

Usage:

1. Add code to AppDelegate

   func application(_ application: UIApplication,
                    supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
           return OrientationManager.shared.orientationLock
   }

2. Use in controller

   class LandscapeController: UIViewController {
   
       /// orientation for one controller
       override func viewDidLoad() {
           super.viewDidLoad()
           OrientationManager.shared.lock(for: .landscape, rotateTo: .landscapeLeft)
       }
   
       /// set previous state of orientation or any new one
       override func viewWillDisappear(_ animated : Bool) {
           super.viewWillDisappear(animated)
           OrientationManager.shared.lock(for: .portrait, rotateTo: .portrait)
       }
   }