Kotlin Migration and Viewfinder Resultpoint visibilty

[DatL4g]

DO NOT MERGE

This PR does not work right now

When using DecoratedBarcodeView, the CameraInstance is unable to configure camera (Other Views and IntentIntegrator untested)

E/CameraInstance: Failed to configure camera
    java.lang.IllegalStateException: Rotation not calculated yet. Call configure() first.
        at com.journeyapps.barcodescanner.camera.CameraManager.isCameraRotated(CameraManager.kt:222)
        at com.journeyapps.barcodescanner.camera.CameraManager.getPreviewSize(CameraManager.kt:345)
        at com.journeyapps.barcodescanner.camera.CameraInstance.getPreviewSize(CameraInstance.kt:97)
        at com.journeyapps.barcodescanner.camera.CameraInstance.access$getPreviewSize$p(CameraInstance.kt:18)
        at com.journeyapps.barcodescanner.camera.CameraInstance$configure$1.run(CameraInstance.kt:182)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:193)
        at android.os.HandlerThread.run(HandlerThread.java:65)

I don't know exactly where the problem is, so I hope someone can help me find and fix the problem