This commit adds initial support for passing null as a valid value for color properties.
When a color property is applied, if it wasn't specified then the default color is applied. Now, when null is passed, no color will be applied
leaving the last color applied as is.

This is useful when showing an Overlay and you'd like to keep the current StatusBar color unaffected. Another usecase would be when you'd like to avoid coloring an icon in BottomTabs.

* Remove currentLeaf

* Fix resolve options

* Remove irrelevant test

* Remove RNNRootViewController clear background color

* Fix title with subtitle options

* Layout changes

* WIP

* Revert "Layout changes"

This reverts commit 4da8cfbd12.

* Clean topBar.component and topBar.background.component when not needed

* Move custom components login from viewController to presenters

* Change waitForRender and enabled property from primitive bool to Bool object

* Fix ios unit tests

* Add unit tests

* Remove RNNReactView observer when view ready

* Load react components from component manager

* Remove createCustomReactView duplication

* Handle render children in each Layout

* Wait for navigation presenter components render, refactor RNNTitleViewHelper

* Fix unit tests

* Add waitForRender for custom react components

* Fixes e2e

* bind viewController to presenters using bindViewController

* Merge options to the specific provided layout

* Moved custom titleView creation to RNNRootViewController

* Moved default options to presenters, moved options applying to presenters, resolved options in RNNOptionsResolver

* Fixes merge options

* Fixes topBar transition on pop

* Prevent titleView creation when react titleView exists

* Fixed unit tests

* Options refactor WIP

* Detach applied options from DTO - WIP

* Added option types and option parsers

* Unit test passes

* Added presenters for each parent type

* Fixes unit tests

* Rename StringParam to Text, changed bottomTabs.drawBehind and topBar.drawBehind default to false

* set layout.backgroundColor default to white

* Added unit tests for RNNViewControllerPresenter

* Set layout.backgroundColor default nil

* Fixes buttons color missing options

* Fix unit test

* fix button color parsing

* Moved default options to presenters

* default options fixes

* Fixes e2e

* Fixes unit tests

* Resolve child options on childWillAppear

* Recrusively setDefaultOptions on rootViewController tree

* Fixes default values

* Fixes tests

* Detached options from presenters, design improvments for LayoutProtocol

* fixes topBar.background.clipToBounds

* Fixes e2e

* Fixes unit tests

* Homogeneous constructors for parent and child view controllers

* Handle parent options merging with children in optionsResolver

* Fix topBar.background.clipToBounds

* Removed unnecessary options merging

* Fixes shared element transition

* Fixed sideMenu inside bottomTabs

* Renamed RNNRootViewProtocol to RNNParentProtocol and added RNNLeafProtocol

* fixed unit test

* Better options resolving

* Revert "Revert "Refactor options (#3962)""

This reverts commit c266041b85.

* Revert "Revert "Fixes shared element transition""

This reverts commit 005f039f7c.

* Revert "Revert "Adresses #3963 - stack options applied to children""

This reverts commit be09cb0e9a.

* Revert "Revert "Added unit test coverage for RNNNavigationController""

This reverts commit 199cebd221.

* Merge stack options

This commits adds support for merging stack options by the stack’s componentId

Also while I’m at it - use fade animation when setting root

* Merge BottomTabs options

Merge BottomTabs options when calling mergeOptions with BottomTabs componentId

* Fixes options