* v2-customButtons

* Update RNNRootViewController.m

* Extract Modal to separate class
* Test ModalStack

* detach tab after attaching new tab

* Fix tests

* Use AHBottomNavigation for BottomTabs

* Process passed options for all layout types

Static options are still processed only for components

* ios e2e fix

* Update RNNNavigationController.m

* custom titleView support

* custom navBar and titleView support

* refactored transition animations

* unit test fix

Otherwise, if the users sets custom insets (additional insets), they override the system adjusted insets. This is not the expected behavior.

* Update part of usage.md to reflect new API changes

* Update usage.md

It was handled inappropriately and some touch events were
intercepted unintentionally.

* adresses #1078

Continued work on Android

* Rename TopTabsLayout to TopTabsViewPager
* Pass ScrollEventListener from component
* Change ViewController.view to protected
* Don't keep ref to view in ComponentController
* Pull IReactView and ReactViewCreator to separate classes
* Ensure ToolBar.menu is created before clearing menu items
* Unmount react view before destroy
* Let TopTabsController set mediator in view visibility handling

* Support creating stack with multiple children

* Add e2e

* Initial overlay implementation on Android

* Move logic to touch delegate

* Implement dismiss Overlay

* Overlay e2e

* fix iOS e2e