* Revert "Fix custom top bar from disappearing after a push (#3109)"

This reverts commit 0e11b95f85.

* Revert "Fixes NPE when initializing twice (#3128)"

This reverts commit 0bf0751f5d.

When modalPresentationStyle is overCurrentContext - previous view is not detached when showing modal.

Add previous view (modal or root) back to hierarchy in ModalPresenter.
Later on this will be controlled by modalPresentationStyle

Add root only if a modal was actually dismissed

Remove temporary suffixes

Delete old classes related to Modal's old implementation which was based on Dialogs

[Breaking[ Modal refactor

* [Breaking] Showing modal removes the previously visible ViewController from hierarchy
* Modal implementation does not rely on Dialog
* Modal view is added to `content` layout
* Overlay is added to `root` layout, on top of the application's content
* Introduce StackControllerBuilder
* Show modal with animation
* Dismiss modal with animation
* Add previous modal at index 0
* Add root at index 0
* dismissAllModals dismisses only top modal with animation