feat(camera-preview): add new focus methods & getFlashMode() (#1442)
feat(camera-preview): add new focus methods & getFlashMode() (#1442)

4 new methods are available in the master:
- getSupportedFocusModes();
- getFocusMode();
- seFocusMode();
- getFlashMode();
klirix/ionic-native,driftyco/ionic-native,driftyco/ionic-native,klirix/ionic-native,klirix/ionic-native,driftyco/ionic-native