Added mediaType, pageZoom, limitsNavigationsToAppBoundDomains iOS-specific webview options, Added handlesURLScheme iOS-specific webview method, Added ContentWorld class, minor bug fixes

Added addUserScript, addUserScripts, removeUserScript, removeUserScripts, removeAllUserScripts WebView methods, Added initialUserScripts WebView option, Added UserScript and UserScriptInjectionTime classes, updated README.md, fix some wrong iOS swift return value on method call handler, added InAppWebViewMethodHandler native class

updated ios Cookie Manager, Added IOSCookieManager class and CookieManager.instance().ios.getAllCookies iOS-specific method, updated README.md

fixed iOS getCookies MyCookieManager, Added limited cookies support on iOS below 11.0 using JavaScript

Add ChromeSafariBrowser support for Android 11

Add android media intents on wildcard input accept

Fix injectStyleFile name to injectCSSFileFromUrl

Fixing wrong casting

Add NTLM Auth

iOS CookieManager.getCookies - Check that URL has suffix of cookie do…

Added support for Dart null-safety feature, Updated integration tests, Fixed missing properties initialization when using InAppWebViewController.fromInAppBrowser, Removed debuggingEnabled WebView option and added AndroidInAppWebViewController.setWebContentsDebuggingEnabled static method

- Reflect package visibility settings in documentation
- Upgrade android projects (lib & example)
- Cleanup ChromeSafariBrowserManager.java
- Upgrade Android dependencies