Previously, all options were cleared and reapplied whenever mergeOptions was called

* WIP

* Apply default options when screen options are null

* modal animations

* fix tests

* refactor

* refactor

* refactor

* refactor

* test fix

* topBar anim

* child disappear bug

* Update app.js

* Update WelcomeScreen.js

* fix tests

* WIP

* Apply default options when screen options are null

* modal animations

* fix tests

* refactor

* refactor

* refactor

* refactor

* test fix

* Update WelcomeScreen.js

* options

* proof of concept

* pop

* test fix

* default options

* scale

* rotation

* null check

* refactor

* refactor

* refactoring

* fix tests