Merge v5 into master

Highlights of this release
* Easier installation
* autolink and reac-native link support
* Shared Element Transition - reimplemented from scratch and new API
* [iOS] showModal animation api parity
* [Android] Animation values are now declared in dp
* [iOS] deprecate topBar.drawBehind
* [Android] RNN is migrating to Kotlin

closes #5904

* Stop manually manage viewControllers store, Iterate layout instead

* Update RNNCommandsHandlerTest.m

Initialize and pass mainWindow to commandsHandler

* Provide findViewController api method

* Fix merge changes

* Optional resizeMode

* Update Element typings

This allows developers more control over how the app is launched, in a backwards-compatible way.