Add iOS support for `bottomTabs.attachMode`.
This property controls when BottomTabs children are attached to hierarchy and when their React views are created.

By default, RNN attaches all children at the same time which might impact loading time as a few screens are instantiated at once.
Using `afterInitialTab` or `onSwitchToTab` generally leads to improved start up time.

Since migrating to CocoaPods, we had to pod install to compile local changes - using legacy build system works around that.

Import lodash sub modules

* Fix dismissed modal event by swiping down gesture

* Fix typescript

modalsDismissed was missing from event declaration. This obscure property represents the number of modals which were dismissed. When dismissModal is called it's 1 and when dismissAllModals is called, it's the number of modals which were visible on screen.

Hey, it is me again 🙂So I am just updating the docs due to some changes to my [starter](https://github.com/kanzitelli/react-native-navigation-starter) which are upgrading RNN to v4 and adding implementation of app logic using [MobX State Tree](https://github.com/mobxjs/mobx-state-tree) as an alternative to Redux.

Related to #4861

* Fix black topBar background color

* Fix largeTitle behavior on iOS 13

* Set  as default modalPresentationStyle

* Sets the system default modalPresentationStyle

* Fix tests

* Fix unit tests

* Fix unit tests

* Add modal.swipeToDismiss option

* Closes #5622

* Fix unit tests

Under certain configurations, creating ReactNativeHost before SoLoader.init throws an exception.
This commit changes the behaviour of the main ReactGateway constructor to ensures host is created after SoLoader.init.

* Fix topBar.noBorder option on iOS 13

* Fix unit tests

* empty commit

When updating buttons with mergeOptions, existing custom buttons are unmounted and then recreated. This commit adds an optimisation which prevents the react components from being recreated.
To avoid unnecessary recreation, add an `id` to the component. If an existing react view is found for that id, it will be reused.

For some reason, AHBottomNavigation has two background color properties - backgroundColor and defaultBackgroundColor. Sometimes the default background color is applied, which causes the BottomTabs to be colored white.

Closes #5533

* Migrate project to workspace

This commit moves all unit tests to the playground workspace

* Fix ios unit tests

* Build pods before testing

* Build typescript before running iOS tests

* Remove xcode 10 support

* Dismiss presented modals and clear the component store on reload

* Detach all overlays on react reload

* Move synchronous dismissing modals to modalManager

* Fix iOS unit tests

Both right and left buttonDisabledColor were not parsed on Android.

* Support centered bottomTab icons using bottomTabs.titleDisplayMode option

* Improve readability, better namings

* Rename setTabItemImagesCentered to centerTabItems

React view title layout didn't recalculated it size on orientation change which caused it to look bad on iPads.

Though icon is required on Android when declaring tabs, it's optional when calling mergeOptions to update tabs.

When BottomTabs are hidden, draw components behind the tabs even if drawBehind isn't set to true explicitly.

This option is used to force large icons to be displayed when only three icons, without titles, are present on the screen.

For some reason layout direction isn't propagated to subviews correctly in the Wix app.
This commit is mostly a workaround, it sets the layout direction on the ViewGroup containing TopBar buttons
so that they appear in the right order in RTL.

Looking at the docs (1581780d2c/docs/docs/styling.md) and code (1581780d2c/lib/ios/RNNSideMenuSideOptions.m (L11)) it's possible to use the shouldStretchDrawer property on sideMenu. This property was however missing in the TS interface.