BREAKING CHANGE: 
• Props updates to `injectedJavaScript` are no longer immutable.

• `injectedJavaScript` no longer attaches a `jsEvaluationValue` property to the `onLoadingFinish` event. Check out: https://github.com/react-native-community/react-native-webview/pull/1119#issuecomment-574919464 to migrate with the same behavior.

* add clearHistory, clearCache and clearFormData android webview api.

* remove pointless `async`

* add docs for new android webview methods

* Update Reference.md

* update commands types

* add more strict type for RNCWebViewUIManager `Commands` property

* feat(new prop): containerStyle

* chore(docs): Add documentation for `containerStyle`

* Add callback for WKWebView's onContentProcessDidTerminate

* Add platform information to docs

* Add new WebViewTerminatedEvent type

* wip

* Update WebViewShared.tsx

* Update config.yml

Apple required us to remove this (see #819)

BREAKING CHANGE: UIWebView has been removed
BREAKING CHANGE: useWebkit prop removal
BREAKING CHANGE: scalesPageToFit prop removal on iOS (since it's not compatible with WKWebview)
BREAKING CHANGE: Renamed RNCWKWebView to RNCWebView on iOS

* add-javaScriptEnabled-in-IOS

* Update WebViewTypes.ts

*  - add focus functionality for devices without touch screen
 (faced problem while developing for android TV, cause there only remote controller for device)

* Reimplement as a ref method.

*  - remove redundant requestFocus

* Add `onScroll` callback for iOS & Android

This code was mostly extracted from https://github.com/react-native-community/react-native-webview/pull/202

I tried and tried to make it work with `Animated.event`'s `useNativeDriver`, but I was unsuccessful 😢 that'll have to be done later once I understand better how Animated's native stuff is hooked up.

* fix crash for missing onScroll

fixes #466 #194

* feat(android): fix overflow issues and match iOS default render error and loading behaviour

* Use babel preset typescript through react-native instead of ts-jest

* Update yarn.lock

* Update README.md

Rewrote the whole repository into typescript. This will provide way better and up to date documentation. This should also add some safety for people contributing 😄 .
Flow types were not working until now which is why this PR doesn't have them but feel free to PR.

This also fixes #384 #435 #206 #171 #168.