Rename startApp animation to setRoot

This commit also resolves the setRoot animations correctly with default options and current child options

lib/android/app/src/main/java/com/reactnativenavigation/parse/AnimationsOptions.java

 
         options.push = NestedAnimationsOptions.parse(json.optJSONObject("push"));
         options.pop = NestedAnimationsOptions.parse(json.optJSONObject("pop"));
-        options.startApp = AnimationOptions.parse(json.optJSONObject("startApp"));
+        options.setRoot = AnimationOptions.parse(json.optJSONObject("setRoot"));
         options.showModal = AnimationOptions.parse(json.optJSONObject("showModal"));
         options.dismissModal = AnimationOptions.parse(json.optJSONObject("dismissModal"));
 
 
     public NestedAnimationsOptions push = new NestedAnimationsOptions();
     public NestedAnimationsOptions pop = new NestedAnimationsOptions();
-    public AnimationOptions startApp = new AnimationOptions();
+    public AnimationOptions setRoot = new AnimationOptions();
     public AnimationOptions showModal = new AnimationOptions();
     public AnimationOptions dismissModal = new AnimationOptions();
 
     public void mergeWith(AnimationsOptions other) {
         push.mergeWith(other.push);
         pop.mergeWith(other.pop);
-        startApp.mergeWith(other.startApp);
+        setRoot.mergeWith(other.setRoot);
         showModal.mergeWith(other.showModal);
         dismissModal.mergeWith(other.dismissModal);
     }
     void mergeWithDefault(AnimationsOptions defaultOptions) {
         push.mergeWithDefault(defaultOptions.push);
         pop.mergeWithDefault(defaultOptions.pop);
-        startApp.mergeWithDefault(defaultOptions.startApp);
+        setRoot.mergeWithDefault(defaultOptions.setRoot);
         showModal.mergeWithDefault(defaultOptions.showModal);
         dismissModal.mergeWithDefault(defaultOptions.dismissModal);
     }

lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/Navigator.java

         }
         root = viewController;
         rootLayout.addView(viewController.getView());
-        if (viewController.options.animations.startApp.hasAnimation()) {
+        Options options = viewController.resolveCurrentOptions().withDefaultOptions(defaultOptions);
+        if (options.animations.setRoot.hasAnimation()) {
             new NavigationAnimator(viewController.getActivity(), new ElementTransitionManager())
-                    .animateStartApp(viewController.getView(), viewController.options.animations.startApp, new AnimatorListenerAdapter() {
+                    .animateStartApp(viewController.getView(), options.animations.setRoot, new AnimatorListenerAdapter() {
                         @Override
                         public void onAnimationEnd(Animator animation) {
                             commandListener.onSuccess(viewController.getId());

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/NavigatorTest.java

         disablePushAnimation(child1);
 
         StackController spy = spy(parentController);
-        spy.options.animations.startApp.enable = new Bool(false);
+        spy.options.animations.setRoot.enable = new Bool(false);
         uut.setRoot(spy, new CommandListenerAdapter());
         spy.push(child1, new CommandListenerAdapter());
         activityController.destroy();