This commit adds support to update props of screen or custom button/title via the mergeOptions api.

```js
Navigation.mergeOptions('myComponentId', {
  passProps: {
    text: 'new value'
  }
});
```

* V2 overlay skeleton (#2097)

* skeleton

* basic test

* remove useless files

* remove useles files

* semicolon

* refactoring

* rm useless files

* alert dialog more styles

* hot fix

* tests

* e2e with own alert

* fix test

* fix ios e2e

* custom dialog WIP

* WIP

* refactor custom dialog

* fix e2e

* gitignore

* fix js tests

* remove hardcode

* snackbar

* drop FAB for now

* fix test

* readme

* WIP

* ios, tests

* refactoring

* current tab

* android tests

* readme

* current tab index ios

* fix tests

* readme

* test fix

* probabl test fix

* update .gitignore added #VSCODE section

* added # VSCODE

Anything passed in a navigator event in a 'passProps' object will be serialized into the Java side Screen object as a HashMap<String, Object>. When RctView starts the React root the props are deserialized into the Bundle passed as props, along with the navigation info. Due to React and Java limitations, JS arrays of arrays are deserialized as dictionaries by index, and arrays of multiple types are not supported.