closes #2487

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

* refactored navigation options

* test fix

* better namings

Super small typo in README.md

* top tabs support - ios

* fixing android tests

* update deps

* Currently doesn't work - need to implement custom TopTab view

* Implement selected and unselected toTab color

* Test options are applied when layout is visible

* Load typface when parsing options

* fix test

* set current tab by container id

* currentTabByContainerID e2e

* lint fix

* e2e test

* largeTitleFix

* update to rn 49 - reload still not working on ios

* bridge fix

* small fixes

* testing with rn50

* removed package-lock

* go back to 49, problem with android in 50

* Implement titleFontFamily in topTab option

* docs

* Pass TypefaceLoader instead of context

* added missing options

* generated docs

* generated docs

* async commands for all events

* test fix

* tabBarItem support

* apply tab items on tabController initialization

* e2e test

* refactored bottomTab item

* tests fix

* tabItem testID fix

* renamed tabBadge to badge

* fix merge

* BottomTab fix

* removed BottomTabs

* Rename TabBar options to BottomTabs

* Restructure docs

* upstream merge

* Fixed bad merge

* More bad merges

* Mostly done, however a few properties missing and tests remain.

* async icons loading

* Left button

* Whoops!

* Added button size

* updated docs

* refactor

* Rebase fixes

* Rebase fixes

* rebase fix

* Rebase fixes

* rebase fixes

* reset contributing

* minor refactor - moved some logic from view o controller

* readme

* doc

* topbar fix

* rm doc

* options presenter fix

* rm userless stuff

* added backgroundImages options

* update readme

* backgroundImage fix

* added unit test

* async await for push and showModal

* async await for push and showModal

* refactored custom transitions

* refactored custom animations

* drawUnder for topBar and bottomTabs

* test fix